TwistedPhil
+1y
The engiine driven would definitely be the best bet, if you can squeeze it on your Mazda. The Oasis is almost just as good, but everyone's right about the downsides- oil, current draw, etc.
The 2 Zeniths could probably be run without the dual batteries, but a better alternator will be a must. With 12 gallons, you'll want to give the AZs a rest when it's hot outside- they'll overheat and wear prematurely. Good luck!
-Phil at FBI