All to often dealers do little if anything before the sale and it's also common for after sale repairs to very low priority. Once they have your money the motivation changes.
Call the inspection whatever but if you search you'll find PDI lists on this and other forums.
Some items that can get overlooked:
1. Bring the slides in and check cabinet access, etc. One poster can't use the bathroom.
2. Check access with DS slides in like parked in front of a friends house.
3. Check the tires date of mfg, guessing the OPs rig tires are 8 years old.
4. Check everywhere for leaks, including under the slides with them out.
5. Crawl under and check everything including rust due to salt perhaps.
If you do a complete PDI you'll know what you're buying before you buy.