Inu-Hanyou1776
1/2 ton status
I'd go with the 17" wheel swampers all around, mainly because it is going to be a mainly off-road application, and also I peronally don't like the idea of different size wheels front and rear. I think it would adversely affect the on-road handling for what little street driving you are going to be doing with it.
Plus, you'd be goofy, and we'd all laugh at you. HAHAHA!!