Welcome to the Forums!
Got to the top of the page where the Air Forums logo is, and click the "Portal" tab. Scroll down, and you should find a utility that helps you to identify Forums members who have volunteered to help do inspections. Also, you will find the "Trailer Inspector's Checklist." Go through the checklist, and you will have inspected pretty much everything. Having an experienced/calibrated set of eyeballs with you may help you to identify kludgey repairs or previous owner "upgrades."
The problem may be that Basecamps are quite different from the rest of the trailer lineup, so finding a volunteer inspector with Basecamp experience would be ideal, yet very difficult. But the good news is that something as recent as a 2017 is unlikely to have been fiddled with too much by the PO, so you are really just checking to make sure that the major appliances are all fully functional and that there are no rotten spots in the floor.
If you are really nervous, check with the local RV repair shops and see if they have a mobile tech service that you could use to have a truly "professional" inspection.