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06-28-2015, 08:20 AM
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#1
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New Member
Join Date: Feb 2014
Location: Rialto
Posts: 3
M.O.C. #14064
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Porpoising
We have a 2015 3735 mk, pull it with a 2013 Ford F-350 dually, have severe problems with porpoising. We travel with the tanks empty. Also have mor ryde pin and mor ryde 4100 suspension. Any help will be appreciated.
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06-28-2015, 09:49 AM
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#2
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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New rig, the montana suspension is likely not the problem. You did not indicate is this has been a problem from the start or a new issue. I would check both hitches, axle torque (often come loose) alignment when hooked up (are you level) and then suspension on truck and trailer to include tires.Porpoising is generally not a problem unless the pavement is rough.
__________________
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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06-28-2015, 10:00 AM
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#3
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Montana Master
Join Date: Jan 2005
Location: North Ridgeville
Posts: 20,229
M.O.C. #2839
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You also may not have enough pin weight.
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06-28-2015, 10:10 AM
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#4
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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If it's happening all the time it's one thing, on certain concrete sections of interstate adjusting speed to lessen it is all you can do. The concrete sections have worn and settled setting it up.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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06-28-2015, 11:31 AM
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#5
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Montana Master
Join Date: Jun 2010
Location: Colorado Springs
Posts: 3,335
M.O.C. #10496
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Quote:
quote:Originally posted by richfaa
You also may not have enough pin weight.
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Agreed. This would be the 1st thing I'd check. 
__________________
2010 3150RL
LevelUp, Dual 6 volt batteries, Progressive Industries EMS HW50C, Honda EU2000i Generator, Bridgestone Duravis R250 tires, Torklift Glowstep Revolution Stairs, LED Tail lights
2015 RAM 3500 Laramie SRW LB CC Cummins 6.7L Aisin Trans B&W RVK3600
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06-28-2015, 01:15 PM
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#6
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Quote:
quote:Originally posted by CORattler
Quote:
quote:Originally posted by richfaa
You also may not have enough pin weight.
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Agreed. This would be the 1st thing I'd check.
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I agree with these two.
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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06-28-2015, 02:00 PM
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#7
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Seasoned Camper
Join Date: Apr 2007
Location: East Syracuse
Posts: 80
M.O.C. #7109
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I have a 2012 F-350 Dually and air bags made a huge difference in our situation. DQDick is 100% correct regarding adjusting speed based on road condition, etc....
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06-28-2015, 04:03 PM
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#8
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Montana Master
Join Date: Oct 2007
Location: silver creek
Posts: 1,507
M.O.C. #7770
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do you have a slider hitch? If it is in the back position, it unloads the truck and it will do what you are saying. Or someone installed the hitch too far back of the axle
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06-28-2015, 04:52 PM
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#9
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Site Team
Join Date: Aug 2007
Location: Omaha
Posts: 6,750
M.O.C. #7560
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I'm with racerjoe! I would venture to say that the hitch is installed to far back in the truck bed or if you have a slider hitch it is in the back position and not in the tow position. I did that one time and it really did the job on us until we realized we had not moved it back to the tow position when we hooked up and hit the road.
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06-29-2015, 01:08 AM
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#10
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Montana Master
Join Date: Mar 2013
Location: Frostproof, FL USA
Posts: 2,362
M.O.C. #13272
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Since he has a dually there would be no reason for him to have a slider, so until he comes back with more information I think we could rule that out.
If the hitch is mounted a couple inches behind the back axle, plus maybe he is towing nose high that combination could cause what he has described pretty quickly.
__________________
Previous: 2008 Montana 3400RL & 2014 3725RL
Current: Full Time 2022 SOB TT Toy Hauler
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06-29-2015, 05:23 AM
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#11
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New Member
Join Date: Feb 2014
Location: Rialto
Posts: 3
M.O.C. #14064
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The hitch weight is 2360 according to montana specs. It does sit level and the hitch in the truck is over the axle and no slider hitch. I also thought it was a weight distribution problem, but I carry no water in the fresh tank that's in the rear. The kitchen does sit to the rear of the unit. It does do it only when I hit an uneven section of freeway. Then I slow down until it stops. This never happened with my hitchiker previously. It was a 33'.
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06-29-2015, 05:27 AM
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#12
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New Member
Join Date: Feb 2014
Location: Rialto
Posts: 3
M.O.C. #14064
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1 retired 06, this problem has been from the start , I have owned the montana for 1 year. Never did it on the previous unit we owned
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06-29-2015, 05:34 AM
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#13
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Quote:
quote:Originally posted by Jeleben
The hitch weight is 2360 according to montana specs.
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I would pay no attention to the Montana specs and take it to a CAT scale and weigh it and calculate what the pin weight REALLY is. Manufacturers specs can be very misleading!
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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06-29-2015, 05:54 AM
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#14
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Montana Master
Join Date: Feb 2007
Location: Winfield
Posts: 7,327
M.O.C. #6846
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This is a common problem and is usually associated with concrete roads and the harmonic undulation of the surface. Keep in mind you have a longer unit now and the interval of hitting the individual concrete sections of the road is different from a shorter unit. As previously mentioned, the solution is to alter the speed from which the porpoising is occurring.
Bingo
__________________
Bingo and Cathy - Our adventures begin in the hills of WV. We are blessed by our 2014 3850FL Big Sky (previous 2011 3750FL and 2007 3400RL) that we pull with a 2007 Chevy Silverado Classic DRW CC dually.
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06-29-2015, 08:27 AM
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#15
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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Quote:
quote:Originally posted by Jeleben
The hitch weight is 2360 according to montana specs. It does sit level and the hitch in the truck is over the axle and no slider hitch. I also thought it was a weight distribution problem, but I carry no water in the fresh tank that's in the rear. The kitchen does sit to the rear of the unit. It does do it only when I hit an uneven section of freeway. Then I slow down until it stops. This never happened with my hitchiker previously. It was a 33'.
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Wish this had been your initial post. I thought your problem was constant, not just when you hit rough roads. Most of us have experienced to one degree or another on rough roads. Reduce speed is the answer, as previously indicated. I have dropped to 40 45 MPH on occasion as I could feel the fiver taking a beating ,
__________________
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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06-29-2015, 03:36 PM
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#16
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Montana Master
Join Date: Nov 2007
Location: Kville
Posts: 2,865
M.O.C. #7871
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Quote:
quote:Originally posted by richfaa
You also may not have enough pin weight.
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That was my first thought.
This is an edit: I too did not realize this was an on going problem. However, it's still worth checking. The PW from the factory means nothing.
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07-03-2015, 04:27 AM
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#17
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Montana Master
Join Date: Jan 2012
Location: Copperas Cove
Posts: 1,426
M.O.C. #12096
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You got to fill your basement with lots and lots of stuff......head on down to Camping World with your credit card...its not hard to do.....lol lol lol
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07-03-2015, 04:51 AM
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#18
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Montana Master
Join Date: Jan 2013
Location: Bridgewater
Posts: 1,196
M.O.C. #13166
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I found that upgrading my shocks to Bilsteins helped to minimize the problem. I can't speak for Ford, but the OEM shocks that are provided on these GM trucks are pretty cheesy.
__________________
2010 Montana 3455SA, Mor/Ryde pin, wet bolts, TST 507, Progressive HW50C, GY G614
2019 Silverado D/A 3500HD LTZ DRW CC
B&W Companion
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07-04-2015, 05:13 AM
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#19
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Montana Master
Join Date: Jan 2013
Location: Depends on temps
Posts: 1,648
M.O.C. #13157
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Had a 2001 F350 DRW with about 32-3500 lbs of pin weight. At around 20K miles I took the OEM shocks off and replaced with Blisteins. Fixed the bouncing you are describing.
A F250 and a F350 use the same part number shocks. Just not enough control for a heavy loaded F350.
Jim
__________________
2012 Ram Laramie 3500 DRW 4x4 3.73 Tow Max Pkg B&W Companion 60 gal RDS aux fuel tank. 2014 Montana 3150RL, 2 A/C's, Leather, 6 Point Jacks, Splendede WD2100XC, Mor/ryde X-Factor, Duravis 250 tires with TST 507RV monitors. 2 x Honda EU2000's
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