Hi Andy. If he's not familiar with the Eriba range (incl the Familia) get him to have a good look around the underside to check that the chassis and sub frames are OK.
Everything else should be as per any caravans; brakes, tow hitch, lights, heating, water etc, he might do a damp test.
From there it depends on you if you want it serviced every year. We don't and we do more than normal mileage in ours but you need to ensure that your Insurance company doesn't insist on a recent service record if you make a claim. Many do.
Randa