See also:

Maximum permissible tire pressure
Maximum permissible tire pressure for one tire. ...

Cleaning the trailer tow hitch
The ball coupling must be cleaned if it becomes dirty or corroded. Remove rust on the ball of the ball coupling, e.g. with a wire brush. Remove dirt with a clean, lint-free cloth or a brush. A ...

Driving with summer tires
Observe the notes in the "Winter operation" section. ...