wheel size on first gen

What is the widest you can go with new wheels to avoid any rubbing or requiring any kind of spacer?

 

I bet you can fit a 35" in there if you don't turn the steering wheel or compress the suspension.

Or if you put on a 6" drop bracket lift with a 3" body lift, you could stuff a bigger tire in there.

 

Also, "with new wheels" you could get an extremely offset rim and not have to use a spacer.
Same disclaimer as above - you can't turn the steering wheel.

 

With no lift I would say a 31” tall and around 10” wide would be safe. Assuming it’s a 6 lug truck

 

Try to stay close to stock with backspace on new wheels. On the older trucks poking out looks terrible.

 

This is the one I just bought for my boy. About as extreme as I think would look good on that truck

 

That is a clean truck.