Having gotten sick of renting trailers from U-Haul for every track day, I've been on a mission to find a very specific ("Lifetime / Craftsman Foldable") trailer that I could use to haul my bike, yet still store in my parking lot. These trailers are discontinued, so finding them is a pain in the ass. They never last more than a day or two on Craigslist (because they're freakin' awesome!), but I finally managed to snag one today:
The trailer does not sit perfectly level w/ my hitch (front of the trailer is higher than the rear), so I'll likely take it to the guys @ Burnaby Hitch to see if they can whip up some custom solution to level it out. Even as is though, it's not bad at all - most of the weight will be right over the trailer's axle.
Bring on the track days!
Trailer specs for those who are interested: http://www.buylifetime.com/products/blt/pid-65005.aspx
I believe mine is the 4x6ft version (not the 5x6ft in the link above); will easily fit one sportbike (all I need), and could probably fit two in there if I really wanted.
The front & rear walls come out and double as ramps that clip on the rear of the trailer.