Back from vacation! Camping for a week with my son..and 100 other 10 year olds. It was a blast.
While watching people load stuff onto a wheel barrel, and then watching it fall out, I realized a wheel barrel with sides that could be raised would be nifty. Possibly collapsible extenders for the side.
Some clamps to attach it to the wheel barrel, a frame work that extends up 18 inches, with nylon acting as the sides.
You wouldn't want a wheel barrel that top heavy full of dirt or rocks, but a bunch of sleeping bags or other bulky but light items it would work great.