What i use are metal 2x4's. Same size as the wood ones but c shaped. Most lumber yards have it. The hose fits in it well.
Nice thing about it is that it will fit in the same square tube as your hose. I am use using the metal that goes on the ground and the top of the metal 2x4s. They are just slightly bigger than the vertical pieces. I also used them but they wouldn't fit in the storage tube with my rhino
Hose.
I am building some adjustable stands, but havent finished them yet.right now
i just set the channel on firewood,boxes or whatever fits.