A large and spacious dryvan trailer with an internal access hatch to repair the air brake system should the need arise.
The trailer legs (or jack) are a multi-stage system, with stage one being lowered all the way, second stage being half raised, third stage is fully raised and final stage is fully retract and folded under the frame.
There is an emergency door release inside the trailer incase the doors are closed while you are inside the trailer.
