i was cruising a website and saw these "fuel" tanks. they look great for water/meth if you want to put a tank on the side of your frame.

http://surpluscenter.com/item.asp?UI...atname=engines

 

I was looking for something like that last spring before I cobbled together an expansion tank for the existing way-too-small 1 gallon w/m tank. You need somewhere around at least 3-4 gallons for serious long-distance towing, depending on how much you spray.

 

4 gallons is nice. the next size up i found on that size was 20 gallon but it was a funky lookin size.

that tank looks perfect for the drivers side frame rail right after the cab. easy filling access from the fender well

 

My plan is to use a 6 Gallon portable boat gas tank. I plan to put a flatbed on my truck soon and put the pump and tank inside either a tool box on either side or my chest type tool box that will be against the headache rack.