When you pick up a vehicle and throw it again, you crash.
https://file.ostentv.dk/GitHub/Vehicle-Mod/%2329/Desktop%202018.07.28%20-%2021.29.54.02.mp4
There is no crash report.

Edit: You also can't pick up the trailer on a server.

Same and i still have this problem
And i kind of worked it out which is to leave then join back and you can place the vehicle down

Fixed and fixed. Coming in v0.20.0