Maybe there is time to update a bit rules for trailer parking as such.
Should be created category such as "vehicle boat/vessel carrier" to be allowed to park in water vicinity and other far away.
Doesn't matter if we do carry windsurfing board on the roof, inside or in attached trailer we just need to be able park close enough to water.
Kiters for obvious reason excluded

but SUP and kayak'er included.
If could be made at the cost of ordinary parking space rather then trailers.
Rule could be caller "priority water parking" - you could park your ordinary car in priority space only when there is at least 1-2 empty space left for priority water vessel carrier car.