i use one. ill post pictures of it tonight. my dad actually built it for me for getting my bike to and from the track. its the fold up trailer with 3/8" (i believe) plywood as a floor. he used some deck paint for the plywood that seals it, plus it has sand in it for traction in the wet. he used aluminum angle for wheel chalks and D-rings for hold downs. the trailer is rock solid and he has MAYBE $400 in it with the cost of the trailer.

the only thing i dont like about it is the tires are rated for 55mph. but i burned 70mph all the way from richmond to maryland, and from richmond to vir with no problems.

i know a lot of other people use the same. best part is, you can take the wheel chalks off and fold it up, out of the way.

ill work on pictures either today or tomorrow.