Google RV checklist, there are several printable PDI checklist that cover EVERYTHING to check and how. Keep in mind that it's your money buying the unit, not the dealers'. Any issues that are found should be fixed immediately if possible, if not get an agreement in writing of when they will be fixed before signing off on the unit. Don't be pressured to sign off before the inspection is completed and YOU are satisfied. It's called a PRE-DELIVERY inspection for a reason.
Good Luck and Congrats on the unit...
2015 Pinnacle 36FBTS
2015 F250 SD Platinum 4x4 - 6.7L PSD :
Titan 50 Gal. Fuel Tank
Slotted and Dimpled Brake Rotors
Air Lift LoadLifter 5000 Ultimate Airbags with WirelessAIR Controller