I've got a 7X12 Wells Cargo MC trailer (tandem axle). I think I paid $4500.00 about 6 years ago. Hell, that was about half the cost of the damage I had inflicted on two of my bikes while towing an open trailer. I use it more than ever imagined.

Here's a link for a tandem like mine
http://www.trailersdirectonlin...D=795

Or a single
http://www.trailersdirectonline.com/temp.php?ID=10