Delamination is a bear to fix. It doesn't matter if the engine in the Class A is that different than a car, they all need maintenance, and sometimes, repair. The best thing that could happen when buying a used motor vehicle is finding one with complete service records. You also need to know how to interpret those records.
A cursory inspection should cost less than $350. A complete inspection of all the systems, the RV structure, and the running gear may approach $350. You will still have the risk of something breaking. If you can't repair it, you'll need the service of a shop to fix it. If you're on the road, you could buy roadside assistance to eliminate stranding.