A little off topic but I 2nd the advice on the PDI. Don't rush through it. Check every latch,switch,knob, catch,valve,outlet,faucet,connection,drawer,door, light,open all windows test everything,room by room.
If you find it after the PDI consider it your fault.Go slow don't let the dealer rush you. Get on the roof and inspect underneath.
I understand buying an RV is an exciting time but curb your enthusiasm until PDI is complete to your satisfaction. Don't compromise your demands or standards due to an upcoming trip. There will be plenty of time for that 1st trip
You have the dealers total attention until you pull off the lot. Then you are in line with all the others. Good Luck