What truck is needed to tow TT weighing 10k lbs.

For 10 years I had a class c motorhome on an e450 chassis with a 6.8l V-10 engine. We went from sea level across the continental divide in the Rockies a few times. Never hiccuped. It was a wonderful power plant. We were not the first ones up the steep slopes, but we made it up the steep slopes without a struggle. We just had to gear down and rev the engine.