I work at a Dodge/Chrysler dealership, The 4500/5500 Dodge truck are horses, they will pull gates off hell, We have three Dodge 4500 @ the rescue squad that i run with and we run the heck out of them no problem's what so ever, We also have 1 ford it has been down at least once a month. We have 2 GMC's with duramax, We like to never got the state to approve them because GVW wasn't high enough. The Dodge's will only run to 77 mph that's it.