Perhaps maybe a middle ground between both an instance (parking garage) and being towed would be suitable?
Example 1. Like SC, players are assigned landing spots upon approaching each market spot (select how big of space they would need S-XL), and duration they would need it (10-40minutes) any amount of time greater than that and their vehicle is 'towed' to a location 10km-20km away from market place. After 48hrs the towed vehicle is sent to their player garage where they would have to fetch it ( for x quantas) and all items that were in the containers are placed in the maket container.
Example 2. Similar to the first example, but instead of the devs having the system move the vehicles. Only trusted organisations or approved individuals can tow the vehicles to the location and they recieve x anount of quantas per removal depending on size. This could be done by implementing a tow point that once attached calaculates how many voxels the contruct is made with. After they have towed it to the holding location zone between 4 set beacons they rmb click 1 of 2 options 1.detach/reattach towed construct 2.detach and begin holding period with confirmation usual messages.
These are only draft ideas and certainly could be reworked an added on to.