my understanding was that 1 ton and down were the same and 1.5 ton and up were the same?
maybe thats true of same overall shape but the cutout clearance for the wheel varies???
i was thinking since the 4100 and 3800 are so close ( 33 inch dia ture vs 35 ish i think) that if it looks ok for 4100 then maybe ok for 3800... def not for 1/2 ton with a 28.5" tire..