That sure looks like a Quigley conversion to me. That winch, transfercase, and front axle certainly make me jealous!
Start with the obvious. Tear out all that junk and give the thing a GOOD cleaning. How many people are you trying to fit in there? It seems to me that
if you just want something for long road trips, you probably want something similar to what many of us have as our "living rooms" in our buses. I would look at the junkyard for some nice captains chairs out of a destroyed minivan or pickup truck. Then you get seatbelts and the ability to recline them back so you can sleep if you'd like.
A pair of golf cart batteries wired into 12 volts and a 700 watt rms or so inverter would be more than sufficient for running a small entertainment system and a fridge. I know that's enough to keep me happy for hours.
Honestly, a small TV (or LCD screen), a PS2 or similar device, especially one that doubles as a DVD player, some headphones, and a small fridge with those comfortable chairs....what more could someone ask for? The only thing stopping you then should be bathroom breaks and gas refills, both of which can happen at the same time. If you're on a shoestring, check out eBay for deals on the stuff. I (and several others) got a couple of those power inverters real cheap about 6 months ago. I paid $80 for two of them. Now I just need to score a deal on a 1500 watt model...