Water moccisan for the main body, replace the turrent with one from the WHALE, installed a side cannon from the RAM, and replaced the motor with one of the helicopter backpacks.
Nothing annoyed the Dreadnoks more than the fact that COBRA had a fleet of swamp boats, and yet they had none. So, they solved that problem by stealing one. They retrofitted the weapons and replaced the motor, increasing the speed and noise it would generate. Now you can hear it from over a half a mile away.