I would like to suggest the addition of a RV or motor home where players can drive around their "homes"...it would be a good realistic and RP addition to the server...
The Tropic, Journey, and (I think) The Shamal all have interiors.
Also does Artict1 (Trailer model 435) for hauling cars. So, You get one land, one sea, and one air vehicle with an interior to it.
They function just the same as a normal property interior, except when you move the car while in the interior, You move with the vehicle. (though you can't tell you're moving while in the interior)