Wow! Take a gander at the Bowlus Road Chief TT. www.bowlusroadchief.com (Don't know how set up a link) Nice mid-sized TT - at $100,000! :R But a NEAT unit nontheless.
I believe that there was one at the entrance of the Pomona RV this year. The guy showing it said it weighted less than a thousand pounds unladed. I have a picture of an old Bowlus I saw several years ago in Elkhart. That one however was a restoration. I'll find the pictures and post them.