I will be needing a commercial mower for next season and I am really liking the Quick duallys. I was thinking of getting a 36" as my primary unit. Right now I have a 44" ztrider. The new quick goes 7.2mph, my rider goes about 5mph. so all in all, the 8" difference between the two is kind of off set by the top speeds. So looking at these two mowers as the same productivity, am I to spoiled to downgrade to a WB? I started with the rider and have never used a WB. Will standing up tire me out more? Does it hurt your back/joints?