designer's own words:Joe’s cart. I have taken into consideration; manufacturing cost, maintainability, durability, and weight, as it will be pulled by a person. There is a loading compartment 300mm deep, 1000mm long and 700mm wide (+-0.21 cubic meters) to enable bottle and newspaper collection with optional grill lid The cart unfolds to the size of a single bed, 2000mm long by 700mm wide topped with a high density foam mattress. Under the bed there is a storage hull 200mm x 700mm x 1000mm (0.14 cubic meters) for storing personal effects. It has a pop up tent canopy for privacy and shelter that will be stored flat on the bed when the unit is shut. Padlocks can be fitted to the unit. I would strongly recommend that it should contain an aluminium framework welded together, not riveted, (for durability) and covered with corrugated plastic. This material is cheap and very endurable and also makes it easy to apply advertisements on the panels in exchange for income. The wheels should have a relatively large diameter (d=250mm) to make the cart easy to pull and deal with uneven surfaces. This combination of materials and dimensions will give this vehicle the durability, maintainability and ease of use that it should have for the purpose it is intended for.