I wasn't sure how much the materials weigh so I did some searching online for very similar materials. The sheet metal is 18ga and according to discountsteel 1sqft weights 2lbs. The panel is 50in X 16ft and weighs 32lbs for round numbers I'm calling it 4ft X16ft for 64sqft that would equal roughly .5lb per sqft. The stats for the panel came from RedBrand that is very likely the brand that Tractor Supply sells. put them together for 2.5lbs per sqft humm that might be a bit heavy...
For the sake of estimating the bed is 4ft X 7ft (not really but for estimation) 28sqft over the top. From the bed to the 3rd brake light is 18in so 1.5ft X 7ft for 10.5sqft for the triangles on the sides (again simplification and estimate purposes) for a total of 38.5 sqft 38.5sqft X 2.5lbs comes out to 96.25lbs est for the cap. That doesn't sound too bad at least not on top of a pickup.
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