You're an experienced motorhomer, but I'll still suggest that you be prepared for a very long and thorough walk through before you execute the deal. try everything. oeprate every system. open every drawer, remove every drawer from its slides, fill the tanks, start and run the generator, try systems on genny power, try them on shore power, try them on battery power, don't assume anything.
Don't let this list scare you..... in my case almost everything I have found has proven to be silly little things and I have just taken care of them myself figuring that I'll do a better job than they will. Still, the more you can get them to address the better I think....
I'm just recently in my new 31L, and found countless little issues... many I didn't notice untill after I drove it away to the campground for the first night I thought I had done a very thorough walk through and caught most everything. i even brough my toolbag with meters, starting battery load tester, my Ideal outlet checker, inspection mirror, etc... Took several hours with it and actually held them past closing time....but I wish that I had taken even more time and removed all the drawers from their slides, etc....
I won't include things that were casued by the long time my coach spent sitting on the dealer's lot.... (such as a bad house battery)
Off the top of my head things I found during and after my walkaround
loose or missing screws all over the place
drawer slides only attached with one screw where there should be 2, drawer slides not aligned properly so that the hold-closed catches don't engage. Also some of the drawers fell out of the slides while DW was loading them bcause the single screws were'nt holding them in place....
rear view camera had a loose connection
shower caulking job bad and the shower leaked
bad place in the roof caulk
missing velcro disks taht hold the cab curtain in place (didn't find this untill I was at the campground)
bathroom door latch not aligned to the strike plate so the door wouldn't stay closed
thermostat was lose on the wall (screws into the paneling with no anchors)
generator wouldn't start
tank heating pad coming unglued
Sounds like you might be picking it up away from home and making a drive with it? See if your dealer has a campground on site that you can stay overnight for the first night