Our local cat dealer sells lightning trailers...couple of buddies and myself bought a 7x29 enclosed...spring axels and no extras other than the spare tire. Low and narrow...it weighs next to nothing, pulls easy, and rides really smooth. (It does sit low enough that off camber grades in parking lots with scrape the rear bumper once in a while, but nothing major) On our first trip with it i set a full power aid bottle next to the rear door, it never moved or tipped in 700 miles...we actually decided the spring axels must ride smoother due to being independent, not very scientific though, just comparing it open trailers with torsion axels.
We like it. Its also nice it have a "garage" to keep them during the off season too.