If adjusted correctly, the brakes will release outomatically when reversing.
The link Hans quoted would provide what you need. Remember:
So technology got rid of the reverse lock, but it will however give you trouble until you sorted the way it works out for yourself.
Erik, you can try this :-
This is one way to solve the problem. But remember when you have braked on a down hill the run in brake of the caravan is already activated (pushed in). You will need to make a plan to get the brake arm extended to fit the gadget.
All on a down hill this could be a bit of a trick but not impossible.
With the older type of release mechanisms like in die photo, handling the caravan in reverse by hand can be quite hazardous as the parking brake also does not work when reversing. I once almost ran my caravan down an decline as I did not appreciate this fact. Three of us could barely stop the van going over a precipice. You only make this mistake once.
I am just wondering Lennie, why you need such a contraption as the hitch looks like the one with automatic reverse release.
Fred I do not need the gadget anymore as I now have a mover. However, before the mover I had to move my 2-ton caravan backwards and uphill a few inches before it would disengage and then I could smell my vehicle's clutch. This "reverst assist" resolved this problem completely.
With regards to downhill stopping before reversing in Leon's last paragraph, I managed the problem by applying the handbrake and moving the vehicle slighty forward which then allowed the "reverst assist" to slip in.
Handy gadget to have even if one has movers.
Good advice Chris!