Don't buy prefabricated boxes. Period. make your own to spec and to the shape of your car.
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Hell hath no fury like a pissed off balloon animal.
"Sup, G?"
"Aren't you white?"
"Only on the outside, craka."
Prefab sucks. The only way to go is to build it to spec and get creative with the design. That way you have a one of a kind., not some box that 1. sound like junk but 2. everybody and their little sister have.