Having a coach properly inspected before you buy is very important and if you are buying remotely or are not terribly familiar with that type of coach an inspection is vital. Unfortunately getting a coach properly inspected can be challenging.
First, you must be aware that two inspections are generally required, one for the coach and another for the chassis, as these are different areas of expertise and require different skill sets. Secondly, those doing the inspection must be properly qualified, hopefully more so than simply being a friend of a friend who owns and RV. You must find the right people for the job and ensure they will provide you with detailed feedback.
In the fall of 2014 I found an RV that seamed to suit of needs well but I live near Vancouver, British Columbia and the coach was located in central Florida. I transacted a deal contingent upon a favorable professional inspection followed by my own personal inspection. I was able to find an RV inspection service for the coach inspection and a mobile diesel repair mechanic for the chassis inspection. I vetted both businesses before hand.
During the inspections issues were found with both inspections. I was provided with a repair estimate for the chassis items and a detailed report on the coach issues. Though not evident in any of the photos or video I had seen on the coach interior or exterior, the coach inspection with a moisture meter detected some delimitation in a side wall. For all things combined the estimate to do proper repairs came out to over $30K. Needless to say I backed away from that deal with a cost of only $730 for the inspection services. If you want more detail on my experience, it was written up in this forum at "Inspection finds $30K in hidden defects
On the positive side, we continued looking and eventually found a great coach 9 months later, just days before I retired. This coach was located close enough to our home that I was able to inspect it personally and the dealer included a warranty to cover anything I might have missed.