get a 24ft. for resale and get the 10,000lbs. axles.
7,000lbs. axles are to small by the time you put the car in and other stuff your GVW is MAXED out.
and a Tekonsha Prodigy brake controler with the direct plug in harness for your truck. (dont need to splice wires)
heres one place that has them do a search for more.
http://www.southwestwheel.com/sidebar/promo2.htm