Did you get them to install a propane water heater? If not add it. The 10 gallon is fantastic and will satisfy all HD's. Also have them run the gas line to where the steam table will be. Do you have an RV style doors? How about extra windows in the side? And DC powered roof vents.
spare tire, equalizer hitch and anti sway bar - installed on your trailer and truck before towing it. If you go to Nananne to pick it up they can do it or if it's delivered then get one installed right away. Mines 26 feet and it tends to excite the semi's without the sway bar.
Retired competition cook. BBQ mentor.