How do you insulate an aluminum camper shell?
When I worked at a camper shell place we used a felt liner to put on the skins of the shells for insulation. If you want to do it on the cheap, go to your local carpet store and get some carpet foam out of the dumpster, glue that on the exposed skin then glue a carpet remnant over the top of it all.
How much does a pickup Shell weigh?
Typical weights of full-size short-bed cab-high truck caps are in the 175 to 190 pound range. Smaller caps weigh a bit less, larger caps weigh a bit more. Tonneaus also vary in weight by size.