1. 143 feet... There are so many factors to give you an answer. One of the more important factors is how good of a driver are you? Then of course, terrain, tires, other mods, ...
2. Chevy's (6 lug) have the same bolt pattern but the center hole is too small to fit over the Toyota hub. If you just gotta have them on, get the center hold machined out. Someone correct me if I'm wrong here but the Toyota wheel is hub centric which means the hub actually centers the wheel so the size of that center hole is critical to be correct.