I made the tank suppport out of mostly 2" x .5" Channel. I had trouble finding anything else that would fit in the frame. I could have got some 2" x .75 bar, but that would have been pretty heavy. now with the tank empty it is really easy to slip it in and out. also I have included a pic of the rails as you can see i wedged a .25" peice of UHMW plastic in the bottom of the frame rails they are little over 2" tall and when i put the 2 inch channel in them they were kind of loose, since uhmw is ultra slippery it makes it easy to pull in and out.
i just made a 1/2 inch pin hole on the side to keep it from sliding out when on the move.
also i am using one of those boomless nozzles, i have not mounted it yet.