How to tag signs that are also sculpture?

[Adam_Franco]

Today I came across this sign, which is also a vehicle/sculpture?

I picked advertising=sign + tourism=artwork + artwork_type=boat + inscription=Norm’s Marine Service, but maybe there are better options. Any suggestions?

[dieterdreist (Martin Koppenhöfer)]

I would not see an artwork here, there is a tag for advertising sculptures: Tag:advertising=sculpture - OpenStreetMap Wiki