disclaimer: i didn't ride in the truck because i was driving my own truck.
tommy from GAS rolled on 20" 1221 wheels with 37" tires on the last exo run. he was the only one on 20s out of the group.
he hit everything that the rest of us hit. didnt pop a bead, didnt go slow , didnt change a flat and kept on going.
he also had the luxury of being able to boot it on the highway when people like me were getting the jelly feeling of 37s on 17s at 22 psi while taking turns at 70 mph.
do whatever you want, but if you go 20s, the kind that will hold up to serious offroad use are EXTREMELY spendy when you consider that $250 per wheel methods is all you need for the same terrain if you're okay with 17s.
I am not shy about what kind of stupid money that I spend on my truck, but the cost of those 20s on Tommy's truck made my eyes get pretty big.