2026 Montana 3901RK Sailun Tire Blowout

[Scottsmi]

Purchased my new fifth wheel late Feb 2026. We towed it from dealership to home which is about 130 miles. Due to some warranty repair issues, we waited to get all approved before returning this weekend. Other issues delayed it, but either way we started the trek back to dealer and about 20 miles back we had a major tire failure. Considering construction in Indiana, move to Apollo, PA and then to my dealer in Hendersonville, NC - maybe just over a 1000 miles. We have the Lippert TPMS and all tires had 120 psi and was a cool day. I’ve attached a picture of the Sailun S637SP 215/75R 17.5 blowout. I’m just grateful we were all safe and no damage under the rig. Looking for others input on this type of failure. Thanks!!

 

[Mikendebbie]

Sorry to hear about the blowout. The pics look like no damage to the wheel well or the fender skirt.

Can you share the date code on the tire? Probably the same on your other tires.

 

[Scottsmi]

Unfortunately, it is in Hendersonville getting worked on - which is about 130 miles from home. I’ll see if the service manager can get the dates from the tires.

 

[Scottsmi]

Sorry to hear about the blowout. The pics look like no damage to the wheel well or the fender skirt.

Can you share the date code on the tire? Probably the same on your other tires.

Zooming in on the front tire, it looks like 0326 or 0325.

 

[RetiredandRollin]

Wow, that is a tough break but not having any cosmetic or structural (underbelly) damage with a blowout like that I'd say is a win. Information for reference with a question, I'm currently on my second set of Sailun on my 2021 Monty 3791RD. The first set and second set combined I put over 60k miles, knock on wood no blowouts. Needless to say mine have been really good to us, although they do have a weird wear pattern but that's for another day.

Can you share what your customary speed is while towing?

 

[Scottsmi]

Wow, that is a tough break but not having any cosmetic or structural (underbelly) damage with a blowout like that I'd say is a win. Information for reference with a question, I'm currently on my second set of Sailun on my 2021 Monty 3791RD. The first set and second set combined I put over 60k miles, knock on wood no blowouts. Needless to say mine have been really good to us, although they do have a weird wear pattern but that's for another day.

Can you share what your customary speed is while towing?

Typically I tow at the posted speed limit, which on this side of the Mississippi it is 70 mph max. At the time of this incident, I was doing 60 mph.

 

[RetiredandRollin]

Wow.... Very interesting, in my humble opinion either you picked up something that resulted in immediate rupture or it was a bad tire from a bad batch. Either way, you asked if anybody had similar experiences, in short my Sailun's have turned out pretty good. In the end, it's just a tire and could have been WAY WAY worse, luckily nobody is hurt and no damage. Good luck and safe travels.

 

[jkxtreme]

I have a 2023 version of that unit. Love the layout but Montana is not without their issues,
First question... are they G or H rated. These units are heavy so you need H rated tires.
Second question... Check the shackles. I had one flip over during a trip on a rough road. Because these trailers are heavy, the up and down movement can be extreme, so one shackle flipped, destroying the tire. I installed a progressive rubber SUMO springs at all four wheels. That helps control that up and down movement. This summer I'll be installing shock absorbers.
Weigh your trailer to see how heavy it is... loaded.
Also, keep an eye on the skirting installed at the bottom of the exterior walls. That skirting has been known to drop. Mine dropped so far that it came out from under the retaining strip... around the entire perimeter... and Montana isn't standing behind the warranty to repair the skirting.

 

[Mikendebbie]

Speed. I rarely exceed 65 mph, usually cruise at 62. Increased speed makes the tires get hotter. Get a tire pressure monitor system and watch your pressures and temps.

 

[Scottsmi]

I have a 2023 version of that unit. Love the layout but Montana is not without their issues,
First question... are they G or H rated. These units are heavy so you need H rated tires.
Second question... Check the shackles. I had one flip over during a trip on a rough road. Because these trailers are heavy, the up and down movement can be extreme, so one shackle flipped, destroying the tire. I installed a progressive rubber SUMO springs at all four wheels. That helps control that up and down movement. This summer I'll be installing shock absorbers.
Weigh your trailer to see how heavy it is... loaded.
Also, keep an eye on the skirting installed at the bottom of the exterior walls. That skirting has been known to drop. Mine dropped so far that it came out from under the retaining strip... around the entire perimeter... and Montana isn't standing behind the warranty to repair the skirting.

Appreciate all the insights on your unit and experiences! I’m flipping a coin on going with the MorRyde independent suspension and disc brake upgrade. These are H rated tires and 8000 pound axles, so I should be good there. I’m going to get it weighed once we fill her up, currently empty from the manufacturer - haven’t even camped in her yet waiting on the warranty work to get completed.

 

[Scottsmi]

Speed. I rarely exceed 65 mph, usually cruise at 62. Increased speed makes the tires get hotter. Get a tire pressure monitor system and watch your pressures and temps.

Understand all of this, as I noted in my original post I have the Lippert Tire Sync Pro system as my rig was prewired for the repeater. Where I went wrong was, I bought the dedicated monitor for the system, but forgot to bring it along on the trip so I was using the Lippert app to monitor. My phone was sitting in the console so if it did alert, I didn’t see or hear it. I’ll have the monitor on the dash going forward. I try to do the speed limit, as it typically keeps people from running up on me unknowingly plus these tires are rated at 75mph. Appreciate your input!

 

[Montana2019]

Appreciate all the insights on your unit and experiences! I’m flipping a coin on going with the MorRyde independent suspension and disc brake upgrade. These are H rated tires and 8000 pound axles, so I should be good there. I’m going to get it weighed once we fill her up, currently empty from the manufacturer - haven’t even camped in her yet waiting on the warranty work to get completed.

My experience: 2020 3721 Legacy Disk brakes
Came from a heavy and wide Carriage with MorRyde that had to replace once over the course of roughly 18 years of ownership.
When we got New Montana I resisted doing the MorRyde and instead went to extended lengths of beefing up existing suspension. Upgraded bolts/bushings, added shocks (which in my case required rerouting gas line).
Still I found the suspension to be subpar. It twisted when backing or turning tight and it didn’t ride or handle like my previous trailer despite being lighter, narrower etc.
Took it MorRyde for them to install, they also had to change out my brakes, as at least in my year the factory disc were not compatible with their setup.
Haven’t had a concern or issue in the 4 years since making the conversion and despite my efforts to tame the ride with stock suspension, the MoRyde just has better road manners.

 

[Cdubue1]

Zooming in on the front tire, it looks like 0326 or 0325.

Hate to hear this. The only thing worse is having 2 blow outs (Rainier G rated) on the same trip with a new rig which is my story! Sailun is what most said to put on them as the endurance models don't go up to the capacity needed. Being you bought it in Feb 2026, more likely it was the 3rd week of the prior year or they really through that together fast. You will find that treddit warranties tires not the dealer, unless you bought a tire warranty. They reimbursed me for 3 tires no problems. As 2 blew out on the trip and the 3rd started spitting belts...probably from the weight of the blow outs on the other 2. I went with H's this time bc I noticed Montana started putting them on the 26 models instead of the G's like were on my 25. Maybe they knew???? Happy Trails!

 

[Mark77]

Not sure if could cause a blowout or not, but depending on what kind of weight is on them with a new, empty rig 120 PSI might be a little high IMO.

Sailun has an inflation chart based on load. I put G rated Sailuns on my rig a year ago and per the chart I run them at 90 PSI. Completed a 5K trip last winter with no tire issues. Sidewalls look fine at that pressure.

I also run a Tire Minder TPMS and in warm weather the pressure will creep up to 95 - 97 PSI, but thats why they say "cold" when you set them. Tire temperature stay cool as well... much cooler than the old Towmax tires I had on the rig. Those were not good tires.

I hit a sharp bump on an exit ramp on one trip on my way to get fuel (with the Towmax tires). The TPMS altered to a rapid pressure loss on a tire. By the time I got to Loves I had lost about 10 PSI in maybe 3 minutes. I thought about what would have happened without the TPMS if I had been just driving down the road losing air pressure. First heat, and them BAM! My point... pay attention to the inflation chart and be sure to have a good TPMS. BTW... Tire Minder works with CarPlay and will alert through the radio when running in the background on your phone. Guessing TST et.al. do the same?

Edit: The rapid pressure loss was a broken belt in the tire. Not salvageable, but there was a tire shop on that exit and I was back on the road within an hour.

 

[Spartacus]

Wow, that is not cool, I have heard that you have to look at the tires they put on because they have been known to put on old outdated tires.