There was a discussion about that on here somewhere. The guy is basically using a fire truck company that outfits these style fords and chevy's with driveshaft PTO's and built in water tanks for fire rescue vehicles. He's adapted the idea to include a heating element and split the 500 gallon capacity I believe into 2 tanks.. waste and fresh, with a built in hose reel in back, and all of the compartments to store gear and your crew. I think it would be an interesting venture if he can find the right people to fund it.