If the Trencher's sale is used here and we ignore buy out caps, that's someone selling this for roughly 2x what they paid. If the sale's used for the Trencher's, that's someone selling the Trencher's for under half of what they paid. That sale's not a great representation of either item's value, so it should be excluded from pricing both.

750 flat would be better here as an independent sale of the Trencher's situation. The newest sale was on Mannco, so that won't be usable.