Hi All,

Does anyone know what kind of tire air pressure is best when hauling a heavy load in the box? I have an FX-4 so i've got the rugged trail offroad tires. Should i pump them up to max psi?

Thanks

 

Try it and see what happens!! Not gonna hurt a thing and then you'll find out what works best for you!! With my truck, I was airing up to 48-50 psi on the rear tires when pulling my trailer (I run 35 all 4 corners otherwise) only to discover this accomplished nothing but to stiffen up the ride. There was no performace/handling increase from increasing the air pressure, so, I stopped doing it. Every tire and every truck combo is going to be different so give it a shot and play with different settings until you find something you like...Like I said, you're not gonna hurt a thing.

 

When I tow my trailer, it is at max PSI - 35. (same tires as you)

 

If that is the max for the tires, they should be at the max all the time, towing or not.

 

When I towed my trailer last week I kept my tires at 35psi with no problems. I also have the rugged FX4 tires.

 

Thanks guys. I usually have my tires set at 35 psi but get quite the bulge in them when loaded down. I'll try running max psi next time and see how it handles.

 

I believe 35 is the max for those tires. If you are worried about the load, you should get an LT tire in place of those passenger car tires.

 

Get LT rated tires ", for towing there night and day difference . i run nitrogen at 80 psi in my wranglers . i pull a 24" travel trailer .