I dont know if you saw the little getter trailer that I was hauling but it has a tank on front from Northern Tool or Harbor Freight. It is ~40gal and cost < $100 with an on demand pump and a spray nozzle. It is wired with the lights into a small 6round for power. It works really well and Ill be putting one on my next rig too.
Steve
Edit: Obviously, I am on Julies computer....
Darn it, I just met these people, so don't post anything weird and give me a bad name! At least Steve was on his own account when he poked fun at Mandi's foot fetish