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I am looking to install a single sub in a truck box behind my rear seat. Would like to keep total cost around $400 or less. Right now I am thinking about buying a single 12 (Probably a Rockford shallow mount) and putting it behind the seat rather than under the seat, because I havent seen many...

I want to use the 7-wire plug at the rear bumper to plug in my 12 air compressor. Does anyone know what the current rating is for the 12V+ feed pin on the 7-wire? Is it fused or go directly to the battery? Actually, I already made a fused plug/adapter for it, but I'm concerned about the...