Cupping on newer truck and newer tires

In my experience the Taco front suspension has a bit of bump steer...

 

The suspension travel range (perimeter) remains the same.
but if the rear is lowered due to added tongue weight
the front suspension's axis can be affected.
Yeah... if it were exaggerated, it's easier to visualize.

It really has nothing to do with the suspension's travel.
Think of the whole suspension assembly rotating on axis.
Toe would likely no longer be at it's ideal setting (spec).

IMO the Tacoma front end is easily subject
to a small amount of bump steer.
Especially if the alignment specs are off or parts are worn.
But if the suspension's alignment remains within spec.
then the toe setting would normally stay pos+
thru-out the suspension's travel perimeters.

But because the suspension's axis may be off some...
the toe is not set where it should be in this particular instance.
An alignment could correct for...
but then once the weight is removed...
it would return back and the alignment would likely
have too much + toe.

Most trucks equipped from a dealership with a "tow package"
have increased the rear leaf spring rates...
and when tongue weight is added...
it does not squat to the point of changing alignment specs.

There's a reason trucks leave the dealership canted ass high.
It's to compensate for load while still staying within alignment specs.

Bottom line... soft springs are not meant for towing.
and there is a real purpose for the addition of the "factory tow package"
It's not just a name with a price tag attached.

 

Waaaaaaaay too much pressure. Those are big truck tires. Like OZ T said...chalk em. I'm guessing 40-45 front, 35-40 rear. My 04 f350 and 08 Duramax both on BFGs are not even close to that pressure, 60 rear on both towing.

 

I ran my BFG 285's at 60 on my Duramax and at 40k they looked new and wear was even across the tread. It's not his inflation causing the cupping.

 

I would agree. Mind seems to have a bit of bump steer.

 

Seeing how I am the best it can't really get any better.

 

I have air bags on the rear. So the truck is level when hauling a load.

I don't really haul a whole lot. Its just my dumper with dirt/rock to the dump. About 5,000 to 5,500 lbs loaded. And thats only a short ride 15 miles on fwy. I would say an average of once every two weeks for the last year.

I am just going to go with what the discount tire guy said. Rotate them every 4K. Its free so no big deal.

I am just going to attribute the heel-toe wear to heavy braking.

 

I have a 2012 DCSB with 17k miles. My front left tire is worn on the outside. I never rotate it so its my fault . The other tires have perfect wear. Mine tires are stock 245/75/16.

 

^So fix your front left suspension alignment. Rotating will just incur the same uneven wear on the other three tires.

 

Does it cover under warranty? I doubt it since its a wear and tear item. If not, I will just rotate it and squeeze as many miles as I could and then get an alignment when I go with an aftermarket set.

 

x100000

correct. Unless it's a POS garage fab LT kit.

 

I bet you hit a curb a little hard with that tire and knocked it out a little. Get an alignment and save your tires.

 

Maybe wife did . She drove it for 2 weeks when her car had issues.

I took a closer look at the tires this morning and noticed the front tires, the outside are worn faster (the left side is more).

 

Do the chalk test to find the exact psi you are running them at. Then go to the dealer is your truck lifted at all your camber could be off i saw a taco at Tim Hortons the other day 6" lift with 35's and his tires looked fucked. His camber was way off i didnt bother talking to the guy because he seemed like a total douche