Light, easily storeable, less aerodynamic drag and a one wheeled trailer will track better than any multiwheeled unit. Besides it looks Kooool and makes people ask "how the hell did you get you're bike on there?".
When I load my bike on the hitch hauler I just pick up one end, then the other...could do the same here. It would not be the first time somebody had certain components around, the right tools and talent and too much pepperoni pizza. No obvious mount, but there is a safety chain, which is a nice touch if photoshopped. The tube diameter is big enough to hide a mount.
nice find. also the text... Want to rally to the races? This Geico/CRFsonly.com “tube” trailer was definitely unique and looked slick. And the tube looked to have an attachment for high-pressure air. Which is kinda cool as this is an air storage tank for tires.
EZ, lift the front wheel into the shoe and lock it down, then lift the back into place and put the strap on.