insulating against heat in a pickup truck topper/canopy thingybobber

[blueee]

hey, I am trying to keep the shell of my truck cool come summertime, I currently have a brown glossy fiberglass shell that keeps much cooler than the flat black campershell I had before. how hot do the aluminum campers shells become? if I pick up a flat black aluminum campers can I easily paint it flat white or shiny white?

do aluminum truck toppers get significantly hotter than fiberglas campers when left in the hot sun?

[streetStreet]

Line it with that silver bubblepop shit they use for windows to cool them down.