I know it's been done tons of times. I'm 90% sure I'm going to be making a rear bumper out of iron/steel that is going to double as an air tank. It's going to be very thick and I know plenty who've done it, so the logistics of a rectangular air tank are not an issue.
But, my question is this: How much effort and money would have to go into making an automated setup with an existing 12v air compressor that constantly keeps the pressure up, and what are my main concerns going to be? I know it'd be best to make a drain plug and that I need to hard-wire the compressor to the battery. I know it needs some sort of pressure relief valve, as well as a switch to kick it on/off when the pressure is between two points. But are the kits I have stumbled across going to be worth their value, etc.?
Also, who here has fabricated rear bumpers before? I haven't even taken mine off, so I don't know how much difficulty I'm going to have making it secure (I have some shackles and the mounts for them, but want to make sure if I'm going to use it for recovery that it's not going to fail because I built it incorrectly.)
Any help is welcome.