Not sure how physics are calculated with preset vehicle on top of a trailer but this looked weird:
https://steamuserimages-a.akamaihd.net/ugc/866241292748693944/3EAA338204EC4BD773C53ADECCB16C6B8BADD308/
When I switched to that car it fell off from that trailer
PC user (master race! )
g29 main in game controller with xbox360 mounted near it for camera control and crane operations.
g13 gaming keyboard. Other peripherals seen by game but not use at all.
Mouse for menus, advanced mode etc.