Only place I could find to mount it cleanly is inside the left front wheel well. Behind the guard, on the cab near the driver door. I can get a shot of it when I get the truck back if you like. I spent a good hour trying to find a solid place for it, and that was the best I could come up with without moving anything else around. There is surprisingly little room under the hood for such things! I am having a custom tank built to fit behind the seat in my single cab. The small one that came with my kit needs to be filled all the time, and I don't even have the biggest jets in it!
Mine is under the drivers door, on the frame... Might rethink the windshield washer res as a supply, unless your just looking to use it for power (which I do not recommend) as you will be filling it every 50-100 miles at most.
10 gallons would last me 400 miles or so when I was running lots of water.
I have a 10 gallon tank mounted in my toolbox. However I have made several 4-8gallon tanks out of 6" PVC with caps glued on it and bolted to the frame under the truck. Then a small fill valve that comes up into the wheel well or even just under the truck that you fill with a hose.
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