Barge EcoMax: The prototype for the later vehicles. Least powerful of the bunch, but still very capable.
Barge EcoMaximumPower: The final version developed by the military, used for squashing enemies and smoking out camps.
Barge MoreBetter TM: The final version developed by the police, used for taking down suspect vehicles as part of the Squish The Criminals program.
The Barge EcoMaximumPower shown in Utah: