The spring loaded clips on the front two poles (tall ones) went bad on mine. I just went to the local ag store and bought a couple clevis type pins that have the round wire that holds them in place. These were less than a couple bucks a piece. To do this I had to drill the hole on the poles all the way through, but it works very well. I haven't had a problem since.
I put a harness on my shack like you would use to haul a deer out of the woods. This works extremely well and puts the weight on your shoulders. I load my shack down with a lot of gear and it pulls well except for deep fresh snow.
