i have a 2011 3500hd 6.0l 4x4 4.11 rears srw reg cab snow plow prep package i think my truck sits to high as far as towing a can pull 10k without a problem i pulled 13k once the steep hills get you if you wanta go slow over them but then again chevy detunes its one ton gas trucks mine only has 320 horses compared to a 3/4 ton 360 horsees i got it because it sits an inch lower in the rear i use my truck almost daily ihave the heavest gas srw gvwr that gm offers mines 10,700 ibs legal mine you i haul alot more with no trailer on it as in on the truck bed a few time i was 15k+ on the scales my truck wieghts 6600ibs dry