For light weight trailers (under 1,000 lbs.), check out either the Perfect Trailer from Canada
http://www.tc-canada.com/tcmindex.html or a reproduction of the classic teardrop trailers from the 1940's (adds to the retro look). My favorite teardrop manufacturer is Camp-Inn in Minnesota
http://www.tinycamper.com/.
The PT Perfect Trailer is a really nice match for the PT - even uses OEM or aftermarket PT tail lights and wheels. It doesn't have the galley features of the teardrops, but it does come with an optional tent insert for an occasional overnighter. Just depends on if your serious about camping, or need a trailer for hauling stuff that you can sleep in if you get stuck somewhere.