We ordered the trailer chassis from a shop at Sa-gae-ngarm Rd. to build the MuH (micro mobile house) main structure. They delivered it in about a month.

The main structure welded from  2×2- 1.5 mm square pipe. 

Shop towed the trailer to us. 

The trailer’s floor is aluminium sheet plate.
the hitch came with an auto brake system where, when the tow vehicle brakes, the inertia of the trailer will press against the tow hitch applying a brake on the trailer wheels. It also has a handbrake and support wheel that can be stowed while towing.

Main Axle has a built in rubber suspension. Drum brake are inside the wheel hub.