Take a Video camera to record the walk thru with your dealer, take notes
how to operate A/C heater, hot water heater, Genny, surround sound , dvd player etc. and before leaving the lot try working all of the above so you have an idea. buy a voltage tester and fuses. buy a truck tire gauge you can get them at a truck stop. if you have a Aqua Hot on your coach buy at least 2 gallons of boiler anti freeze that is made for this type of system. distilled water for the batteries, black tank treatment, tissue paper,paper towels, bed linens,pillows, flashlight.
hope this helps
Congrats on your new coach
2009 TS ENVOY 42