Make sure the dealer shows you that ALL the appliances work in all modes of operation.
Make sure the furnace and air conditioner work.
Ensure the refridgerator and water heater function in both electric and gas modes.
The water heater in my 2013 Eagle 284BHS was installed sitting on its own gas supply line, in effect choking off it's own supply of gas. It was clearly a case of sloppy work during production. I had to return to the dealer to get it fixed, about 90 miles each way. Jayco refused to compensate me in any way for my cost in pulling the trailer back to the dealer to get the production flaw fixed.
So save yourself similar grief and expense and make sure the dealer demonstrates everything works in your presence during the delivery walk through.
FAA A&P mechanic, ex-RV dealer parts dept
Retired B-52 Gunner/Flight Examiner, B-52 Crew Chief
2016 Jayco Eagle HT 29.5 FBDS w/ 15,000 BTU AC, 50 amp service, upgraded counter top, thermal pane windows, elec. stab jacks, outside grill, backup camera and MORryde pin box.
2011 GMC 2500HD DURAMAX/ ALLISON