Straight from the EPA website under vehicles subject to gas guzzler tax:
" The Gas Guzzler Tax is assessed on new cars that do not meet required fuel economy levels. These taxes apply only to passenger cars. Trucks, minivans, and sport utility vehicles (SUV) are not covered because these vehicle types were not widely available in 1978 and were rarely used for non-commercial purposes. "
So there is no gas guzzler tax on any Truck Van or SUV but that is a tax on the federal level, there could be state or local specific environmental related taxes that could come up but I doubt there are any in Georgia only the bunny huggers in places like California are going nuts with pollution regulations to my knowledge.