From your signature, the retail Falken A/T3W you chose has great reviews, especially as a street tire. 285/65-20 is a 34.6" tire, 2.6" taller than OE raising the vehicle 1.3". That is a large tire. It is 50% heavier than the OE tire. Even at 35psi it has 5% more load capacity than OE. What pressures are you running? Why did you choose that size? Did you mean 285/55-20?
Is the truck leveled or lifted? That doesn't look like the tire in the photo. The biggest I've seen on an OE suspension is 275/65-20, a 34.1" tire, pictured below.