+1
Like he stated, most islands are homes or houses. They should have the same "garage" as other house properties. Simple management menu on the island property marker would do it.
There are many issues with furniture and vehicles, once it is not in sight or you wander to the other side of island, The vehicles will glitch through, destroying them and then having to wait on an admin for a refund request and those typically take some time to complete, leaving you stranded on the island typically for quite some time. This would fix that issue and make the island more of a home, rather than the feel of a commercial property.
This is not a big community change however, so I natrually assume it will not get much recognition due to being so few of islands to own. But it would fix several issues and make the islands more viable. I would definately pay credits for something like that if it was requested to do so. Or even RP some form of Property and Housing with payment to install a "secured parking".