37" tires on 18" or 20" rims ?

[mrprimo]

My next upgrade I want is a little taller tire. I'm presently running PRO-COMP XTREME a/t 33" x 13.50 on 18" MC2 rims. (They came on the truck when I bought it)

I'm happy with the style of the rims and width of the tire but think the 33" height make them look like I'm riding on "donuts". I was considering going with 37" NITTO DUNE GRAPPLER's. Has anyone put these on 18" rims? Is there any difference between putting 37" tires on 20" rims and 18" rims? Would they both have equal amount of rub if any?

Thanks for any help.

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