The back issue did not result from hauling around the tractors but rather from excited grandchild..ouch. However, I'd hate to give up my meat birds that I raise in my tractors. On my hoop tractor I never got around to putting wheels on and had just dragged it everyday another 8ft. My "box" tractor I lifted from the front and again moved it another 8ft. Both are 8 x 4. Any suggestions on how to adapt these to ease the lift/drag motions.