Dear John,
I like to set the tripod up in a pickup truck's flatbed, because I find that this elevation change is sufficient enough for me, above grade level. That said, and you seem to be serious about this going forward, I would search for a wide stance pickup that is at least a one-half ton with proper heavy rear suspension, and I would also investigate side stabilizers that extend outward from the bottom of the truck, to possibly isolate the truck from the suspension system, as the support poles contact the ground. These are fabulous devices that prevent the truck from rocking in a strong wind. A narrow bodied SUV has a natural center of gravity that is too high, and with you standing on a roof platform, you will surely introduce a rocking motion and, or a resonance that will be difficult to eliminate.
Just my two pennies from experience...
jim k
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