With regards to using a goose neck. They haul better so IMHO they are the best chioce for extended trips and daily use. A 35/36 ft goose equates to a 28ft tag (usable floor space) at a minimum a 46-48 ft goose for mutiple car transportation. If this is going to be a car trasport only then it should be a pretty basic trailer with only the options required for vehicle security and ease of use, good interior lighting (above and below), access doors, winch, quality tie down anchors and straps, heavy axles and 16"min tire. etc...and if the budget allows an aluminum trailer (your getting paid to haul cars not a trailer) Thats my