stuff disappears from vehicles, happened to me on my 4 heaviest vehicles.
i have not made an experiment myself yet, as i dont know how to effectivly increase save sizes, all these vehicles where above 20kB.
vehicle uploads:
Latest vehicle: https://steamcommunity.com/sharedfiles/filedetails/?id=2713538777
Third: vehicle: https://steamcommunity.com/sharedfiles/filedetails/?id=2713537554
Second vehicle: https://steamcommunity.com/sharedfiles/filedetails/?id=2713539695
First vehicle: https://steamcommunity.com/sharedfiles/filedetails/?id=2713540494 (after being spawned and taken back in)
And yes, modded workbench, but the file thing is something that is not talked about.