Goodyear Endurance

[TedM55]

From Keystone website...
"Q-When I add up the weight capacity of the 4 tires on my trailer, it is less than the trailer weighs (or the GVWR). Does this mean the tires are not heavy enough for my trailer?
Not at all! This is a common miscalculation in the industry. In order to calculate the actual weight on the tires, it is necessary to subtract the hitch weight. The hitch weight is actually being carried by your tow vehicle not the tires on the trailer.
For example, if the tires are rated at 2000 lbs each x 4=8000 lbs and the unit weighs (or has a GVWR of) 9000 lbs with a hitch weight of 1200 lbs, the actual weight on the trailer tires is 7800 lbs which is within the weight rating of the tires."

[sourdough]

Originally Posted by TedM55

From Keystone website...
"Q-When I add up the weight capacity of the 4 tires on my trailer, it is less than the trailer weighs (or the GVWR). Does this mean the tires are not heavy enough for my trailer?
Not at all! This is a common miscalculation in the industry. In order to calculate the actual weight on the tires, it is necessary to subtract the hitch weight. The hitch weight is actually being carried by your tow vehicle not the tires on the trailer.
For example, if the tires are rated at 2000 lbs each x 4=8000 lbs and the unit weighs (or has a GVWR of) 9000 lbs with a hitch weight of 1200 lbs, the actual weight on the trailer tires is 7800 lbs which is within the weight rating of the tires."

The above response is why IMO so many folks have had tire issues over the years. I don't depend on Keystone or anyone else to tell me if I need tires to support the entire weight of the trailer - I do. The above assumes all tires are loaded equally (they aren't), both sides are loaded equally (they aren't) and you will never tilt the trailer forward or aft transferring considerable extra weight to either the front or rear tires. All they want to do is give you the least they have to and you deal with the aftermath. Here is the current RVIA tire load recommendation which virtually all manufacturers are now following:

"RVIA (Recriational Vehicle Industry Association) in 2017 started to require a 10% Reserve Load (Load capability more than the GAWR minimum)."

[CalandLinda]

The NHTSA provides the FMVSS (standards) to manufacturers of RV trailers. Those standards are minimum requirements and MUST be complied with.

I normally just write this one from memory. Today I went to the actual standard and copied the following statement.

This is from FMVSS 571.120, paragraph S10.2: On RV trailers, the sum of the GAWRs of all axles on the vehicle plus the vehicle manufacturer's recommended tongue weight must not be less than the GVWR. If tongue weight is specified as a range, the minimum value must be used.

[socoinc]

Carl explain to me why a Goodyear Endurance G614-235-85-R16 doesn’t belong in a Montana 5th wheel. It’s 14 ply. Granted it’s a little more than that china tire. I could go on & on but I’ll get kicked off...

[mhs4771]

Ref LT vs ST, for years and years most trailer just ran the same tires as used on cars and light duty trucks. ST tires only came into being in the 10 or 12 years. Prior to that Montanas and other larger trailers just ran LT tires and I bet if you could find any real OLD Timers campers they would say they traveled thousands of mile and never had any tire problems.
Now granted LT tires are not a good match for the heavier Fifth Wheels out there because they just don't have the capacity, unless you happen to have a MountainAir with Duals on tandem axles.

[beeje]

Originally Posted by socoinc

Carl explain to me why a Goodyear Endurance G614-235-85-R16 doesn’t belong in a Montana 5th wheel. It’s 14 ply. Granted it’s a little more than that china tire. I could go on & on but I’ll get kicked off...

I think you have something confused. The Goodyear endurance tire is an 10 ply E Rated Tire.
Goodyear g614 is a completely different animal. It's a 14 ply G rated Tire.
I think what was stated is the endurance tire has no business on a very heavy 5th wheel, and I wholeheartedly agree with that statement
You can use the Goodyear g614 if you wish but the price is more than double the Sailun s637.
There have been multiple reports of blowouts with the Goodyear g614
As far as I know there has been zero blowouts with the Sailun s637

[Carl n Susan]

Originally Posted by socoinc

Carl explain to me why a Goodyear Endurance G614-235-85-R16 doesn’t belong in a Montana 5th wheel. It’s 14 ply. Granted it’s a little more than that china tire. I could go on & on but I’ll get kicked off...

First let's clear up a couple of things. The Goodyear Endurance ST235/85/R16 E tires are *NOT* the same as Goodyear G614 RST LT235/85/R16 G

The Goodyear Endurance ST235/85/R16 tire is an E range (10 ply) tire with an aspect ration of 80, not 85 (not that makes a lot of difference). It's Load Index is 123 (i.e. 3,480 lbs.) and it's max pressure is 80 P.S.I.

The Goodyear G614 RST LT235/85/R16 is a G range tire (14 ply) with a Load Index of 126 (i.e. 3,750 lbs) and it's max pressure is 110 P.S.I.

Montana axles are rated at 7,000 lbs. The current RVIA specs say the two tires on that axle must provide at least a 10% reserve capacity. That equals 7,700 lbs per axle or 3,850 lbs per tire.

The GY Endurance at 3,480 doesn't even cover the axle capacity (3,420 x 2 = 6,840) and does not belong on a 7K axle regardless.

The GY G614 at 3,750 covers the axle capacity of 7K (3,750 x 2 = 7,504) but does not meet the reserve capacity requirement (7,700). That is why Montana no longer offers them as an option

[mlh]

Originally Posted by socoinc

Carl explain to me why a Goodyear Endurance G614-235-85-R16 doesn’t belong in a Montana 5th wheel. It’s 14 ply. Granted it’s a little more than that china tire. I could go on & on but I’ll get kicked off...

The people who have been around here for a while prefer to use tires with a known track record. For anyone who wishes to use something different be our guest.
Lynwood

[Creeker]

Made in USA Goodyear Endurance tires come factory on all Jayco 5ers. Including their largest/heaviest most Luxurious models. I'm sure their 44' Pinnacle is as heavy as any Montana.

[beeje]

Originally Posted by Creeker

Made in USA Goodyear Endurance tires come factory on all Jayco 5ers. Including their largest/heaviest most Luxurious models. I'm sure their 44' Pinnacle is as heavy as any Montana.

I'm sure they are just as heavy probably even heavier. But if I was to buy one of those, the tires would come off of it as soon as it left the dealership.

[Carl n Susan]

I am guessing, as it is is too darn hot here to go out to some paved parking lot to check, but I bet if they have the GY Endurance tires (which Jayco calls the "Beast") ST255/85R16 which are Load Range E (10 ply) with a Load Index of 129 (4080 lbs.) at 80 P.S.I.

I don't know how they would fit under a Montana but could be an option. I still don't like "E" tires and the price is substantially higher than a Sailun.

[socoinc]

Been running Goodyear Endurance on my duel wheel duel axle bobcat, mini x with attachments on one of my trailers. Other trailer has John Deere 710 backhoe with 24” to 48” buckets & 1800 foot pound breaker. Never had a problem.

[PSFORD99]

Originally Posted by socoinc

Been running Goodyear Endurance on my duel wheel duel axle bobcat, mini x with attachments on one of my trailers. Other trailer has John Deere 710 backhoe with 24” to 48” buckets & 1800 foot pound breaker. Never had a problem.

Those endurance have been on the market for 3.5 years , give them some time ,and get back with us.

There is no sense in pushing those Endurance on the members here that know the score. Its pretty simple these newer Montana fifth wheels are just too heavy for those E rated Endurance, they don't cover the weight rating ,and RIVA.

You are not doing anyone any good by suggesting those Endurance belong on these fifth wheels. As mentioned even the G614 cannot cover the weight rating . People are asking for trouble with those Endurance on heavy fifth wheels .

[PSFORD99]

Originally Posted by Carl n Susan

I am guessing, as it is is too darn hot here to go out to some paved parking lot to check, but I bet if they have the GY Endurance tires (which Jayco calls the "Beast") ST255/85R16 which are Load Range E (10 ply) with a Load Index of 129 (4080 lbs.) at 80 P.S.I.

I don't know how they would fit under a Montana but could be an option. I still don't like "E" tires and the price is substantially higher than a Sailun.

If they are indeed running the ST255/85/16 then they have also upgraded the wheel size. Pretty sure most Montana fifth wheels have the 6" wide wheels, those 255/85/16's require a minimum of a 6.5 wheel ,or better a 7"

If we were to run those 255's ,new wheels would most likely be needed. Wouldn't make much sense ,just go the Sailuns .

[mlh]

All tires are the same, round and black. There is no difference in them.
Lynwood

[PSFORD99]

Originally Posted by mlh

All tires are the same, round and black. There is no difference in them.
Lynwood

Very true

[beeje]

Originally Posted by mlh

All tires are the same, round and black. There is no difference in them.
Lynwood

Except for the ones that already blowed up. They're still black but far from round

[mlh]

I meant mew ones.
Lynwood

[CalandLinda]

Originally Posted by mlh

All tires are the same, round and black. There is no difference in them.
Lynwood

LOL!

[whutfles]

Regarding the weight recertification, tell your insurance Agent that you recertified your weight and ask if they would make that notation on your policy. Ask him to certify that they will still insure you and cover your liability with those mods and with what you are pulling. It's better to find out before the accident than after. When they insurred you, they were only aware of the factory certification. You probably have an obligation to advise them that changes have been made to the vehicle and find out how much weight they will insure you to pull.