i advise that you have them run all the systems, including pressurizing the water system.
make sure you know how to do that for all of them.
i'll mention a few things that come up here all the time, from new owners:
make sure you know how to use the electric/propane sides of the water heater.
make sure you know how manually retract the slideout.
make sure you know where the converter, fuses and breakers are.
make sure you know how to use the electric/propane sides of the fridge.
make sure you know what every switch's function is for.
make sure you know where the fuse is, if you cross the wires to the battery.
make sure you know how to hook up to cable and how to hook up the tv.
make sure you know how to setup/take down the awning.
make sure you know where your tank discharges are and which are which.
make sure you know where your low point drains are.
make sure you know where your WH's bypass is.
make sure you know where your water pump and filter are.
that's all i can think of, right now. i'll add more if i think of any others.
__________________
Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity