Outstanding. Beyond superb. One thing, when you rechain, consider some 4x4 blocking (3.5" square--about 80mm full size) to suppoert the bucket and especially the excavator end of the arm. The owner of the trailer would not wan the equipment digging into the top, so, they'd make a cribbing of 4x4 to support it. Probably two pieces parallel to the long axis, and two cross-wise spiked into the first two.