I have used my pallet forks multiple times on my Bobcat CT450 (49HP) tractor. I moved a 500 pound water tank, a couple of 1500 pound hay bales and a 1000 pound wood chipper. The forks worked well. Attaching and adjusting the spacing between the forks was easy. The ratchets kept the forks attached firmly to the bucket and mostly resisted being knocked sideways. I see no need for a spacer bar. You should check the tension on the ratchet periodically as they will loosen with time.