At least you aren't going with the usual Monsters. I too am getting sick of seeing them on every truck online.
I lost 1.5mpg on my average, and 3.60mpg highway with my 20" wheels and 33" Toyo's.
Go with the Nitto Terra Grapplers, awesome A/T. When I get a set of FX4 wheels ( possilby yours? ) If they are low on tread I may wrap them in the Terra Grap A/Ts or Coopers. Highly doubt BFG but in 285/65/18 it is possible. Problem is, BFG A/T KOs are an awesome tire, but they look hideous on any aftermarket wheel, only look best on stock wheels, no matter what truck. Expecially FX4 wheels, and Z71 wheels.
3.) Where is a good place to get wheels & tires? I can't find consistent prices really been going by this site
RIMZONE
Exactly there. Great deals, good shipment, careful shipment and great transaction. Its oddly called RimzOneOnline,should be called RimZoneOnline imo.