I have had to go the motorized tractor with a manure trailer route, pushing that wheel barrow, no matter what kind of wheels, just tweaks me just wrong. They make ergonomic apple pickers, Easy Lift Ergo Durafork for Manure Clean-up (Case of 3) - ShanesTack
, but don't buy from that site their prices are outrageous. I'm going to be buying new apple pickers, my last wonderfork just broke. I really like the wonder forks but they let me make to heavy a load and by the end of 14 stalls or doing one of the pastures I'm practically crawling.
Back problems are no fun. If you can't have full time help can you do just 2 or 3 times per week for a couple of hours each time? I don't know how many stalls you need to clean but I average 15 mins per stall unless I'm stripping it out, and can clean 4-6 stalls in an hour normally. So, my barn takes me between 2 & 3 hrs to do a full pick, clean waterers and put down the next feed.