Rear tire wear and adding rear sway bar...

[Oil Stain]

I have a 2012 3500 DRW 52k miles, all stock in regards to tires, ride height and suspension. I tow a 15k+ 5th wheel. I'm on my second set of tires, they are Firestone TransForce with 26k miles on them.

I started to notice that on the outside tire of the dually, they seem to be wearing faster than the inside tires. Both rear tires treads are wearing nice and straight across, no cupping or edge wear, but tread depth is lower on the outside tire. They have never been rotated. When I tow, I inflate the rears to 80#psi and when not towing to 40#psi.

My thoughts as to the possible issue is the 5th wheels hitch weight is adding more stress in cornering, thus wearing out the outer tires faster? Would adding a sway help?

My questions are why is the outside tire wearing out faster?
Would adding a rear sway help?
Has anybody added a sway bar on a dually?

I've already been on Hellwig's site and they do make a sway bar for my truck.

 

[Deleted member 995608]

My old 04.5 2500 DRW wore the rear tires the same way. I never rotated the rears either and let them wear in like a pair of shoes. I'd go through two pairs of steer tires to one set of drive tires. I also ran the same air pressure as you for towing and unloaded weights.

 

[SnoKing]

80 lbs inflation is way over inflated for a dually. Snoking

 

[Cummins12V98]

I run 65lbs with mine but I have a 5,500#pin weight. I would advise lowering to 55-60psi. Run the fronts at 80 ALL the time.

 

[Oil Stain]

Thanks guys for the replies! Any opinions on a sway bar?

 

[TJJEEPER]

I didn't run a sway bar on mine until I went to a truck camper. When I was pulling my 38 foot toy hauler I ran 70 lbs in the rear and I have individual air bags on the rear. I've towed in hella nasty cross winds and never felt the need for the sway bar. The truck camper is a different animal. I put the Helwig Big Wig bar on and it made a huge difference.

I'm still running the stock General Tires and have about 15,000 towing the toy hauler. I'll get another 10,000 at least on the tires. No rotation. Wear is even.

All that said, I don't think a sway bar will change your wear pattern much.