Look for a mobile RV tech in the area. You pay them their standard hourly rate and can usually agree on a fixed amount of time you are willing to pay for. I'd say 1-3 hours, depending on how thorough you want them to be. Give them a checklist of things you want tested or checked out.
You may also want a chassis shop to check out the engine, tranny, suspension, etc. That's separate and harder to arrange, since it has to go to the shop.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL