I'm halfway between the all manual land cruiser idea and
@jkrispies idea of an old 4x4 truck with a twist. Instead of a truck with a shell, I would consider a 1967-72 era Suburban, preferably the K20 variety for an extra beefy frame and 4x4. Room for the family plus secured cargo, along with 3 doors to be unique. They are also one of the few vehicles from that era with full cabin AC for your summer, non-apocalyptic driving needs. Attached is a sample pic of the suburban from the AMC show "Dark Winds."