The Sorento is highly unlikely to have sufficient payload for a 3,000+ pound trailer and a family. The maximum payload is 1,537, but that's for the most base model 4 cylinder 2WD, not the loaded v6 AWD one with 5,000 pounds of "towing capacity". Also a 3.3L naturally aspirated v6 isn't going to have the power to pull a full profile trailer through even moderate hills. Look to a crew cab truck, full sized SUV, or 3/4 or 1 ton van if you want to haul a family and a travel trailer. Even then make sure you look for a payload rating more than about 1,500 pounds as surprisingly many half ton trucks and SUVs have fairly minimal payload ratings.