As the title states, the truck has been trying to fly away for me. This happens when, after building the vehicle storage module on the truck you try to attach further storage created by the printer. Placing 2 makes the truck extremely unstable, attaching anything further after that will make the truck begin clipping and flying away. This occurs regardless of whether or not you are tied to another vehicle. Using the game with Mouse/Keyboard, Steam version of the game running on Windows 10 x64. Untested on the rover but the two vehicles behave similarly so it may also attempt to take flight. While humorous at first it does tend to become a bit obnoxious not being able to move properly . Best way to avoid the problem i found is to just avoid placing the extra storage modules on.