Sounds like my Durango fits the bill for a decent BOV. Cummins 4bt, 5-speed (NV4500), 28-30 mpg, and when I installed the engine I wired it extremely simply. Every other system could go out, and I would still be able to run the starter and fuel shutoff. Worse case I'm running without gauges...no big deal. I have over 600 mile cruising range now, add one of my spare tanks in the back for extra range, and I could double that.
Not what I built it for though...its just a nice daily driver that can tow anything I want and have fun with. Bit its nice to know it could come in handy.
I'm fortunate to live in an area with lots of connections, and know people in many different industries/careers that could be handy in an emergency, such as medical, mechanical, and electrical (Nurses/doctors, mechanics, and power company linemen), as well as family members and friends who are great hunters (I don't hunt myself), and old-fashioned farm families who know how to prepare everything. I guess I'd be able to chip in with vehicles and my mechanical abilities, and my talent for working well under pressure.
Jim