biggest

My truck is almost completely stock. '06 SE Crew Cab - 18" OEM 5 spoke Rims - 265-70-18 SRA. I want to put Nitto Dune Grapplers on my truck without having to have a lift kit, a body lift, or bed leveler. is it possible to put a 285-65-18 Nitto Dune on it as is? What is the biggest tire you...