Tough call on wanting to mount a surfboard on the roof. Think about a few things before you go that route, especially on your Solera with solar panels. Constant up and down with a nine ft board, sometimes in windy conditions. Locating a nine foot by width footprint ,while not interfering with roof hatchs, a/c unit, tv antenna, etc. Wind drag (i.e turbulence ) is a factor as well. As another poster has said, there is that company that sells the plug in hitch type, I just think they are way over priced. Since you only mentioned a single surfboard carry, what about some kind of fastening system to the rear ladder rack.
On the maintenance side of the house, if your handy, things like oil changes are really simple, just drop me a pm with concerns and i'll give you things to do to your '10, since I have been on the road longer and learned a few things along the Solera road.