I met up with a Turbo VR^ guy at a recent gathering. He put his battery in the spare tire well so his FMIC piping could go in. When I asked him about "what if" he simply stated if they can put FIX A FLAT in a Ferrari why can't I use it too.
I am never gonna add all the weight of a top sound system in my car, but if I was I'g go with a sub- level enclosure, with plexi top, and keep my fix a flat handy.
Subaru has road side assistance for a while, but almost every insurance policy has that stuff too, tire change, towing, gas refill, door opening, jump starts... and we pay for it every month!!