From your first post I'd say a full sized SUV (because of the 4-6 people thing) and something made before the mid 70s because you mentioned "with no or very little elctronics", it was sometime in the mid 70s when almost all vehicles went to electronics ignition systems, before that they used points and usually had mechanical fuel pumps. With something as simple as this setup you can carry spare points and an ign coil incase of an EMP.
Your big issue is the number of people your looking to have in the vehicle, you might have to have a trailer as well.
Another thought would be a 4x4 van, yes they are out there or can be switched over from 2wd. It would be good for basic off road use but nothing hard core.
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