I did a number of different installs in mine, did not get to work on the mountaineers though. Anyway, not sure on your goals or budget, but if you want loud right out of the gate..... SPL > Four - 12" subs, firing up, enclosure top at the base of the window line, areo-ports or curfed port rear. Daily driving > Pair of 12" subs, firing rear, large port, low tuned, deep box pushed towards rear hatch. Front stage, there are a number of kick-pods available, or deaden the doors nicely and put a solid 5.25" in with an adapter plate for the stock cut out, and then go low on the A-pillar for tweeter mounting. The worst rattles are going to come from the rear hatch, rear quarters, front doors and a little on the hood. So I suggest emailing
[email protected] and he will help you out with exactly with what you need, and nothing more.