Some of the mountain roads in Georgia really need a high clearance vehicle (unless they have been upgraded since I last visited). Upper Svaneti (approaching from Zugdidi), Racha and Khevsureti are OK for lower vehicles, but the road up to Tusheti will not be kind to a low clearance vehicle.
In Armenia there are fewer tough mountain roads (road condition is generally poor but not to the extent of needing a high clearance vehicle), though I did a couple of very nice off-piste drives, one across the Geghama Highlands from Lake Sevan to Abovyan which would have been challenging in a low clearance vehicle and another from Tsar in what was then Nagorno Karabakh to Jermuk in Armenia which absolutely needed a 4x4, though recent political changes mean this would now be impossible to attempt.
So overall, the vast majority of the region is fine for a low clearance car. You can always hire (quite cheaply) a 4x4 to do certain trips and not damage your van.
EO
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EurasiaOverland a memoir of one quarter of a million kilometres by road through all of the Former USSR, Western and Southern Asia.
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