Here are few pages with military trailers that are up for auction. I think they are a little large but worth a look anyway. Think real cheap.
http://cgi.govliquidation.com/auction/view?id=817363
http://cgi.govliquidation.com/auction/view?id=815248
http://cgi.govliquidation.com/auction/view?id=815249
http://cgi.govliquidation.com/auction/view?id=823710
http://cgi.govliquidation.com/auction/view?id=817363
http://cgi.govliquidation.com/auction/view?id=815248
http://cgi.govliquidation.com/auction/view?id=815249
http://cgi.govliquidation.com/auction/view?id=823710