7500lbs is a lot for a gas motor,,Towing that with a HemiMega Cab would make it sweat,,if not chit itself
The hemi comes in a 1 ton dually, they have to be capable of towing around 15k lbs and living. I doubt they would do it well though. And like EVERY company now claims more then that for their half tons towing anyways I bet it can do it