Hi
Delivery day is already an "overload" situation. You have a bunch of paperwork to go through and go over. There's the normal "hurry up and wait" associated with any organization. You will spend somewhere between two and three hours on a walk through of the trailer. A *ton* of stuff will be presented as part of that.
There are some really crazy things you could spend *days* going through. If you are not a trained RV tech, chances are pulling the tires to look at the brakes isn't going to do much for you. You don't know what you're looking at ....
Check each of the appliances and systems to make sure they work. If it's 98 degrees out, seeing that the heater runs may not be practical. In the summer, seeing that the A/C works is indeed practical.
Make sure all the cabinets, doors, and drawers open, close and latch properly. This includes the latches on the outside storage bins.
The bigger issue is to be sure you understand how to operate the various devices. You very much want to know how to safely hitch and unhitch the trailer. That includes leveling on a site and proper use of chocks (as well as the stabilizers).
A bit more mundane is the proper way to handle the tanks, their cleaning, and dumping. This is not the area you want to get a "surprise" in. Even dealing with the vent fans and "stink flow" is important to understand ( = open a window, don't pull the air through the black tank ....).
Little things matter. The switch on the power pole gets turned off *before* you plug in and only gets turned on after all cables are hooked up. When you tear down, the stuff inside the trailer gets turned off first. Then the switch on the pole gets turned off. Finally you start unplugging cables ...
Yes, that swerved away from "punch down" pretty quickly. You have a three year warranty. If you find issues with this or that, you have a *lot* of time to get them fixed. It's way better to focus on safety and operation details than on inspecting for loose wire nuts behind every outlet ....
Bob