I purchased a fimco 40 gal 3pt sprayer with a small folding boom and wand. I wanted more sprayer hose and auto recoil of the longer hose. So I welded together some scrap and mounted an air hose reel on the top. I painted the welded up assembly green. Reworked the plumbing to use the reel and added a pipe to hold the wand (the Fimco factory clips are junk).
What I didn't account for is that where I mounted the reel made it wanted to fall over toward the hitch when the sprayer was empty. I had some 10 lb sand-filled rectangular weights laying around. I bolted 2 of those under the front to counterbalance the hose reel. Nice and stable now.
It'll have to sit until May before I'll put any fluid in it and try it out.