My 74 built 88" Station Wagon Gigi is classed as car, but the 300Tdi is classed as a van so has commercial van insurance, but it's quite cheap. Maybe it depends on where you live, and how loaded with plushness the Landy is !

Insurance doesn't ask anything from us either.

Hmm, a neighbour says his insurer requires him to keep his in his garage! I have a Second hand X- lock on the gears and hand brake, which makes towing her difficult for a would be thief, since she's locked I third gear. But my insurance don't ask...