You certainly want to have a pre-inspection done. Actually, as soon as possible, prior to the delivery as the inspector will certainly find issues.
The standard is NRVIA
https://nrvia.org/locate/
I can't say that I was really impressed with this group, they did some checks, but overall, if you can find a good mobile RV Tech, that may be a better choice.
Further, be sure to get an RV appraisal on the value of your purchase through David Lester. David is on Facebook under RV Pricing and Values.