If the wings are off, I would think you don't need to worry about the tail spring much. Maybe 50 lbs at most now, verses maybe 150 with the wings folded of weight on the tailwheel. I used carpet to make a sling to haul wings that were strapped to the side of a truck. Ends of the carpet were fastened to a couple of 2x4s that ended up fastened to the wall at the top of the wing. JImChuk