Home Made Soft Wash Rig Video

I’m looking at it more as a house pre-treat, driveway etc. pretreat system. I have it now with 3/8" hose and 2.2 gal pump. It works well but I wanted to copy his plumping for cleaning the pump etc without having to empty the tank. I can’t mount it in my truck. I carry too much for the staining business. All of this is driving me to a larger trailer…
Thanks again for the help and input.