Loud bang when towing

Essential
Essential Forum Participant Posts: 51
edited April 2012 in Caravans #1

Have just taken our van off the seasonal pitch for a weekend away and something strange happened to us twice.

 

We hitched up on site and set off and after about 30 seconds there was a huge bang from the van that we could feel right through the bottom of the car.  We jumped out and checked out the hitch and everything was in order.  There was nothing out of place
in the van either to suggest something had fallen.

 

On the way back the exact same thing happened again but we couldn't see what it could be.

 

Has anyone got any suggestions?  We wondered whether it was something to do with the handbrake.