Finally got one of these Edgun Eazy Fill Valves. This is great gizmo if your having to refill frequently on the bench or in the field. Fit a 90degree fitting on it for easier use. https://youtu.be/6MdT-kX5Rfw
My buddy Mr. Stevenson put mine together for me. Not sure where he got the gun holders from. But it sure is awesome and beats carrying around everything by hand! I can wheel around all my stuff no problem. I can Push it thru gravel with ease