Well I have weighed. Multiple times. Not 100% sure I am getting the significance of some of the numbers however.

Trailer numbers:
UVW - 15,000 lbs
Hitch weight: 2,980
GVWR - 20,000 lbs

Truck numbers:
UVW - 8,540 (CAT scale - steer axle 4,960 / drive axle 3,580)
GCWR - 28,700
Max loaded trailer weight - 20,400 (2019 Ford tow guide)
GVWR - 11,500 (door sticker)
Rear GAWR - 7,230 (door tire sticker)
Tires - Michelin Defender LTX - Max Load 3,640 each - Load Range E

So with a CAT pin weight of 3,300 and a empty rear axle weight of 3580, Ive got 6,880 on the rear axle rated for 7230.

With tires with a max load of 3640, times two, I have 7280 weight rating on the rear, and 6880 of weight on them.

Im sure I load the trailer heaver slightly here and there, which is why I aqm guessing I am running over, but these numbers seem reasonable?

 

Your rear axle weight is similar to my 2019 F350 as my unloaded rear axle weight was around 3650. Is the UVW on the truck rear axle including your 5th Wheel Hitch? Not much difference in weight but it does add up. I also had the 60 gallon Transfer Flow replacement tank which added 26 more gallons to the truck, plus the extra weight of the steel tank itself. I think I'd take it back to the tire dealer and see what they have to say. 6880 on the rear axle is within specs.

 

I very quickly received this email back from Michelin after going to their website and entering the issue:

Thanks for contacting the Michelin Consumer Care Team.

When both shoulders of the tread wear faster than the adjacent tread surfaces, this could be indicative of improper inflation pressure, hard cornering, frequent mountain driving, improper tire rotation practices or a rim width too wide for the tire. Commercial delivery service vehicle tires frequently experience this type of wear pattern.

If the tire's tread depth is at or below 2/32" in any groove, or if cord material under the tread is exposed, then the tire must be replaced. If sufficient tread remains, verify proper rim width and vehicle fitment as well as verify/adjust inflation pressures, then rotate the tires for maximum wear.

The Michelin Passenger and Light Truck Tire Limited Warranty covers your tires against defects in workmanship and materials for the life of the original usable tread, or six years from date of purchase, whichever comes first. Shoulder wear greater than 2/32” as compared to the center of the tire would be considered irregular wear and would void a treadwear warranty.

Your satisfaction is important to us. We recommend presenting the vehicle to an authorized tire dealer for inspection and have the dealer call us at the telephone number below so we can review while you are there.

We hope this issue has been addressed to your satisfaction. If we can assist you further, please respond to this email or call us at 866-866-6605 (toll-free) between 8:00 a.m. and 5:00 p.m. EST Monday through Friday.

We appreciate your business and thank you for choosing Michelin.

 

I have a couple of questions. 1. Are you using a WDH? 2. Also do you an anti-sway of some sort? You need to rotate you tires. When towing you put more load on the rear tires and this is one of the causes on the rear tires. The wearing can also be caused by swaying of the trailer causing the tire to flex side to side, digging into the outside tread, not rotating tire will show this.

Smokeploe

 

No weight distribution. It's a 5th wheel toy hauler Im typically hauling. I have very few bumper pull trailers and the ones I do I pull very seldom.

Yes, I have a Hellwig Big Wig

 

So I guess the bottom line is that Ive driven 22,000 miles on them in 15 months pulling a 5th wheel maybe 7 times for 500 miles each and thats all it took to rub the shoulders off the rear tires.

Taking them back and having them blame me for not rotating tires just means that the weird shoulder wear is limited to the rear and not all four.

If I had rotated them, then all four would look like this by 44,000 miles and that still not ok.

Perhaps the rubber compound is just too soft.

The weight is where it should be, so I just dont know what to think other than to take them back and see how many different ways they blame me.

 

I don't see the loaded trailer weight in your post above. If it weighs 15k empty with 2980 pin weight, which is right at 20% of the 15k. Do you have a loaded trailer axle weight? You may have more pin weight than you think you have.

 

You need to keep them rotated. The inflation at 65psi front will wear the center some more.

You are in some sort of wear pattern now.

On our F150s I can tell when the dealer doesn’t do the rotation at oil changes because the rear outsides will wear abnormally. Can see it from 10ft away. Always loaded with the little 17” 110 or 108 michelins.

 

stock tire size? rims?

Dave

 

Not rotating your tires in 22k miles will absolutely cause wear on the tires even worse when towing, while that may not be your entire issue it didn't help at all.

 

When I plug my CAT receipts into towingplanner it says I have a trailer weight of 16,760 when I brought it home from the dealership, which had put surprisingly quite a bit of water in the fresh tank, so thats not a dry weight, nor is it full of all my crud for a real trip, but somewhere in between, as I run dry.

My pin will be lower that the 3,300 I had on purchase day since we are loading totes and putting them in the garage for the next trip. Im trying to take as much off the truck as possible

 

Same size it came from the factory on. LT275/70R18E on whatever wheels the XLTs came with in 2019

 

Yeah I was absolutely shocked when the Discount Tire guy told me a purchase date of 11/21 and 32,000 miles.

I would have testified on a stack of stacks that I hadn't driven 5,000 miles over the last 15 months.

Time flies apparently...

Sounds like self-inflicted injury here due to not rotating coupled with towing heavy.

 

How did you get the CAT pin weight of 3300? Did you drop the trailer on the CAT scale and drive the truck off of the scale? Or at least lifted the king pin off of the truck?

I could be wrong, but if you're calling 3300 the weight on the front landing gear as seen by the CAT scale, your actual pin weight could be a lot higher than that.

 

I weighed the truck and trailer on the CAT.

Dropped the trailer

Then reweighed the truck alone.

Then entered the CAT ticket weights into towingplanner.com

That website does all the calculation of pin weight for me.