i have 34x10.50 on my niva(with toyota driveline 4.7  gears) wich is bigger then a sammy (7 "longer wheel base) and i cant believe how well they work in hard wood mud at idle speed the mud just seemed to fall out of the tread i have been on some rocks and they didnt let me down at all. But with heavy side wall and a light truck i am running 8lbs of air i think i could go lower but no bead locks