Installed the frame shims for my ProPride hitch that the dealer left out when he installed it last October. Now the jack tubes don't splay out under load.
Discovered that the dealer also left off the frame bracket plates, causing the hitch to turn way out of whack after our recent trip; ordered yet more replacement parts.
Also discovered that my spare tire was entirely ornamental -- carrier mounting bolt turned freely, making it impossible to unmount the tire. So happy I discovered this before I needed it. Vise grips wouldn't hold carriage bolt head. Brought carrier and all in to dealer to repair under warranty. While there, had a discussion about failure to tell customers about having multiple "parts left over" after installing new hitch units.