Too much hitch weight. Too much wind resistance (width and height). Too long.
Option 1: bail out, lose a grand. (A good, fair-minded dealer would refund it. If they won't, then IMO you do not want to buy anything from them and $1000 is the price of wisdom.)
Option 2: negotiate for a different trailer, but now they have you by the cojones and can really make money from you.
Option 3: trade the SUV for a pickup to get more wheelbase, more GVWR, higher hitch rating, and greater safety.
By the way, I have a 2008 Lexus GX460... basically the same vehicle but more fluff. No way would I want to tow more than 5K lbs, 70 sq ft frontal area, and 23'-24' length.
