My wife and I are taking delivery of a 2016 Cougar 333MKS. This will be our first 5er, and an upgrade from a 2012 Trail-Sport 27' bunkhouse TT. Current TV is a 2015 Ram 2500 CTD/auto, CC, 4x4, SB, ...
Well it seems like your rig is going to work out great! The FW towing experience is usually a good one. You have the tree thing figured out, as you always have to be watching for clearance.
The dealer should have driven the 90 miles (sent a flunky) with your power cord. The batteries will need charging, not to mention the inconvenience for you. If your batteries get down to 12.2, before your cord shows up, I'd put a charger on them.