I am really sorry that you had issues with the condition of your trailer at delivery. My 19' was delivered yesterday (same truck) and I had zero issues with the trailer condition. There was no damage and everything was present and accounted for.
My table top was also under the bed mattress but my bed is in the front so the angle was different. I'm speculating here but with your trailer on the end of the truck I bet it bounced more. I was in the middle and probably a bit more stable.
I did find my coupler lock in the drawer with the keys and other documents.
Advice for those taking delivery at addresses other than your home address - be sure to confirm and reconfirm the delivery address with the driver. Dave had a nice, but unplanned, tour of Northern Virginia ...