Can you stay overnight at the dealership to 'test drive' it ?
Unless very experienced, trying it is really the only way to check it out
and suggest both of you take short videos or each section of the walk thru so you can refer to it later...
I have been rv'ing for a long time and still have our walk thru videos in a folder on my tablet. New rv's have new 'stuff' and it helps.
Congrats and good luck !
Just chill and make it fun !