Yes. Lower the rear seats before attempting to insert a surfboard.
Tips on what exactly? It's a Mk2 with a conservatory bolted to the back. Same rules apply as any other Mk2. If it has a tow bar, it will have driven to Ilfracombe and back 40,000 times with a HyperStarRaider 2-berth caravan on the back. Apart from the usual considerations, you'll have to worry about retribution from people who were stuck behind it on the A23 at some point.