If your gonna be using it while trailer is hooked up, 2 would be the way to go. Don't think you would be able to get in truck bed with 1 swing out and the trailer hooked up.
What kinda trailer is that?
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Added question, with two Jerry cans is it best to store them side by side or front to rear.
My thoughts are front to rear to limit damage with the thinking side by side they are more likely to be both damaged...
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