Dont know how much help this is... I pulled our 1966 Tradewind (4086 lbs. dry weight) with our 1976 Suzuki Samuri @ 5500 ft alt. It was REAL slow up a 2 degree climb and I only went 20 miles (mostly flat). I USUALLY pull it with a 1972 F-250 V8 with automatic trans and 4.11 gear... very well. Bob :)