I have only bought and owned used or second hand. Ill never make enough money to lose money on a new purchase. In cars and Rv's. Start to educate yourself on maintenance issues by reading on this site and others. I wouldn't rely on an RV inspection as much as doing it myself as the industry doesn't seem to have a standard. However Search your location for the best RV dealer and get a feel for them. Go visit perhaps they will have an inspection service that the rig can be towed to and looked at and you feel that they would do a good job at it.
That said part of rving is doing it yourself as problems can and do occur over the road. The more you know the better your camping will be. What seems to be a big problem when you dont know, can be just a simple fix. So study and learn before you pull the trigger. You will thank yourself later.