You know after responding to my Welcome Break post in ‘the other place’ I was convinced this was going to be a wind up saying you’d found a supply of free ABS Suzies!
Nothing else to add I’m afraid, I’m a fair weather drawbar driver, (Never done it in the rain and don’t really want to) so have little to add. Except perhaps to couple it up and then spray all around the connections with white grease or spray on PTFE or something to add a bit of weather seal over the coupling.