looking at getting rockstars for an h3 alpha in 20". what is the biggest size tire iI can safely put on, without worrying about stressing the drivetrain too much (meaning taxing cv's or the tranny/ transfer case). need to be minimum of all terrain, preferably mud terrain though. also what is the general consensus of brand/ model tire for off roading that will fit the 20" rim? wife will be daily driving it, but i will be driving it when going camping/ off roading/ and taking family trips. thanks in advance... Gregg