Weight is a bigger issue than the length or height IMO. I have an older 6x12 Pace Flat nose steel frame. 16 MPG with 3 bikes and TONS of gear for a race weekend. Saying that I have a buddy that has a new 7x22 Aluminum tandem axle rig , Rubber floor, 120V light system, Alum Cabinets upper and lower at the front. Took that trailer down to Unadilla for the GNCC last Sept with 3 bikes and 1 quad, generator, cook stoves, BBQ's and all kinds of other stuff for a 3 day race weekend and got 16 MPG towing all that. Nice trailer but kinda big. If I was to buy new, I'd go Aluminum, V-nose, 6x12 (or better yet 7x12) Torsion axle, barn rear doors, RV door the side with a screen door, 120V lights and Gen plug on the outside and figure a way to hang 2 bunks for sleeping.