sounds like you mean 3/4" movement from front to rear of the wheels. this is way too much. you will likely have the truck wandering all over the place. most likely this is caused by tie-rod ends, centre link or steering box. this is a dangerous condition.
Trade the rear tires to the front and the front tires to the rear. Every other time you do it, trade the right front tire to the left rear and right rear to left front
Because your making right turns going too fast. Your front end may also be out of alignment. If the tires are wearing unevenly take it to a shop for an alignment.
Unless the tires are directional (indicated by an arrow on the sidewall), radial tires can be cross rotated. On FWD vehicles the front tires are moved straight back and the rear tires are crossed to the front. On RWD vehicles the rear tires are moved straight to the front and the front tires are crossed to the rear.
move back tires to front and front tires to back
Could be a front wheel bearing, or worn tires, could be normal?
Probably you need to align the tires.
Sounds like swaybar bushings but just a guess.
yes they sound like 4 wheel drive mud tires when bad you can tell what side is bad by turning the wheel slightly to the left and then right while going straight
Tires should be rotated every 7500 miles for good even tire wear and tire life. Remeber only rotate tires front to back on the same side of the car....no cross rotations. Example: right front goes to right rear..... left front tire goes to left rear and vice versus.
And move the fronts straight back, that's how I do it, as long as they are not directional tires.
My guess is you have a tire ply separation going on. Check your front tires.
Tires/wheels out of balance?