We were in these countries this summer, but or vehicle runs on diesel, so we didn't look into LPG stations too much. But we remember seeing several by the road. Lots of the old Ladas run on gas as it is quite cheap.
We also met a fellow traveler who was driving a LPG Hummer. I think you should not expect a problem. You still have a petrol tank, right!?
Azerbaijan can be impossible to enter with an old vehicle. Read or report here http://backroadvagrants.com/travel-g...baijan-border/
We liked Georgia's nature the most and spent 7 weeks there. Don't miss Tusheti and do the circle around Svaneti, if your vehicles and riders can bear the dirt roads!
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