I have a v-10 f250 toolbox truck loaded with hardware, and a 7.3 f350 utility toolbox dump. We tow a 12lb trailer with rebar or equipment in the steepest mountains in Pa to maintain or build communication sites. The diesel will always out haul the gasser hands down .Both will eat you out of fuel at the end of the day. If we are hauling light or just need the truck the V-10 is the way to go less noise, smooth ride and cheaper to run day to day type driving. If you tow twice a year heck a 1500 hd would work. Towing on a 7ooft elevation , you don't need alot of motor.