I towed a 7'X14' before too and it was a nice size trailer that carried 3 busas and gear. The reason I went with the 8'X20' was to have the ability to haul a corvette or something if I wanted.
Yeah my corvette wouldn't go into my 8X20 without alotta work so i sold it. Cousin of mine bought it to Store his 1 of 433 Pontiac Firebirds that was made So it went to a good home.