jsmcada's 65 gallon sprayer is the best looking spray rig that I have seen on a Roxor. He did a great job on it. His Sprayer Hose set up has a Hose Reel. Very Professional, and well thought out. If you do some serious spraying, this is about as good as it gets on a Roxor.
I have a 25 Gallon Sprayer. It fits between the wheel wells. I have a Hard Cab rear Bulk Head on my Roxor. I have D Rings bolted to the bulk head to ratchet strap the spray tank in place. I am using a Fan Sprayer mounted to the Reese Hitch. A folding Boom Sprayer would probably be even better, and still could be fabricated to be Reese Hitch Mounted. My hand sprayer hose is just loose in the bed.
I have a Receptacle (120V Weather Proof only wired up as 12V) mounted on the Rear Bulkhead. I just plug the sprayer in for it to be powered up. I use this same receptacle for my Seeder which also is Reese Hitch Mounted.
I have my sprayer Power Cord junction-ed near the motor and have a switch cord going to the cab so I can turn the sprayer on and off from the cab.
Bob R