yeh 20 inch is an issue for true all season as nokian doesnt make the wr3 in our size - i went with 19s for this reason. they do make the hakkas in 20inch though but then you wld need 2 sets of wheels.
I bit the bullet and got four OEM 20” rims so I now have the Dunlaps on one and the original tires the truck came with on the other.
Man, 20” rim+tire=HEAVY!
I can barely lift one.
Frank