As a matter of interest next time you’re parked somewhere in the company of other lorries have a look around to see if there’s another one with a Moffet hanging off of the back. If the trailer is empty have a quick look at the fifth wheel, you’ll be surprised at the daylight you can see between it and the trailer rubbing plate.
As Robroy alluded to earlier these are NOT cars and especially when empty or light they need to be driven in a very sedate manner.