If you can spend a couple of nights at the dealership or campground very close. Just use all the systems. Play like you are dry camping. Run the generator, inverters, fresh water pump, etc.
Then plan a possible return of the unit to the dealer for 30 to 90 days for warranty work. Not trying to be a butthead. Notice I said "plan". Hopefully you will get lucky and have a unit you can use out of the box. I did. Be reasonable with your check list. Fix the small things you can even if it costs you a few dollars. You'll probably do a better job than the techs at the dealer.
2016 Winnebago Journey 40R
2018 Rubicon
1982 FJ40 Toyota Land Cruiser
2020 Keystone Outback 327CG
2020 Dodge Ram 2500
Polaris RZR XP 1000
4 Cats
3 Dogs
1 Bottle of Jack Daniels
Two old hippies still trying to find ourselves!