"Spokey Joe" single child trailer from eBay, £27.
Covers and steel support structure removed and stored.
Plastic trellis/mesh cable-tied on for a floor.
Archery gear transport...
It's a very useful steel tube chassis, adaptable to any number of trailer projects I think.
30 seconds later..folded flat. You can see one of the Quick-release wheel spindles. You press a button and pull wheel off. Tow-bar is hinged and folds under.