They are all money pits. Imagine you house on the back of a flatbed truck. Now imagine the truck going down the average freeway in the country. Bouncing, jarring, tilting, and twisting as it goes down the road. Also, imagine all the secondary systems like water, both 12volt and 120 volt electricity, holding tanks, septic piping, drain pipes, air conditioner units, propane heaters, water heaters, sinks, toilets, and other items not made by the coach manufacturer. With all this stuff jostling down the road at 65 MPH things are bound to come lose, crack, unscrew, twist, dislodge, and just plain break.
If you are going to have any RV, new or used, be prepared to pay to have things fixed or replaced unless you can do it yourself. I'm not trying to talk you out of anything...just don't think any RV, inspected or not, is not going to cost you something with regular frequency. The more complex they are the more stuff there is to break or malfunction. Having it inspected for the chassis in a great idea but you must know what you are looking for in all the various systems in the "house" part of the motorhome unless you can find an "expert" somewhere to do it for you. Even then, there may be things hidden from view or are just about to break. All you can do is the best you can to determine the current condition of a unit. Stuff about to break is beyond most folks to determine unless it is an obvious mechanical or electrical issue.
RVing is fun and is a great way to travel; especially with all the issues with air travel with luggage costs, weight restrictions, airport headaches and late and overbooked flights. Having what you want to take with you in quantities far more than you can stuff into a suitcase weighing less than 51 pounds as well as your own bed, towels, sheets, food and pets is a great want to travel.