fourfa -
Try this. Go to Joanne's or Michaels and look for "magnetic sheets". You can get them in sizes up to 8.5"x11". They are very flexible. They will probably have adhesive on one side but you don't have to solve that right now (if it works, maybe just paint the adhesive side the same color as your truck?!?!?). In your example picture it looks like your roof is not flat. It looks like it has cargo slats/bumps/whatever. You can cut the magnetic sheets into strips that fit into the flat parts. Lay about 1/2 of the strip onto the cab roof and 1/2 of the strip onto the bed/cap.
A real picture of your truck, roof and side, with transition to bed/cap, would help a lot.
CarloSW2
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