i own a 23 ft, towed with a 3/4 ton dodge, 2004, just went to a 2010 f350 1 ton diesal power stroke, i tow 2 hours each way, mass to rhode island 120 miles, the dodge would do the job, but struggled on the hills, i wpuld not tow with a ram 1500, very far, the 21 ft parker would probable be...