A member of our camping group bought a new Ford Edge to tow his 19 ft Fun Finder trailer (Approx
weight 3100 lbs) He
sold the Edge less than 2 years later . When asked why he
sold the Edge, he said that towing the trailer had caused a lot of wear to the vehicle , the vehicle was starting to have mechanical problems and he felt it was not adequate for towing that much
weight. I don't know the weight of your Casita and again not being adequate was his opinion (He towed the trailer about 12000 miles in the two years)