I have been advised by the RMS inspectors that the use of a padlock to stop the handle of your caravan from lifting off the tow ball when towing is not acceptable.
You must use a quick release device e.g. D-shackle, R-clip or similar.
Been using a padlock on the hitch of anything that I've towed for over 30 years & will continue to do so. Currently using ABUS padlocks on the hitches of our caravan, boat trailer & off-road camper trailer.
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Cheers Desert Dweller.
Our land abounds in Natures gifts. Of beauty rich and rare.
I've got various locking devices for the Aliner (4 different ones so far).
I also have a heavy duty box trailer - it normally lives in the locked garage - but when I take it down to the Big Green Shed carpark, I always ensure the tow hitch is padlocked - I want re-assurance that when I come out with all my goodies, my trailer is still attached to my car !
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Wondering about ShortNorth ? - Short North is the railwayman's nickname for the NSWGR main line between Sydney and Newcastle
Son in Law lost an expensive almost new tandem boat trailer a few years ago. Was removed from the hitch & towed away. Police advice was to lock it on & to park with the trailer reversed solidly into the gutter, jamming it firmly onto the hitch.
They said that professional fishers had been known to target this sort of trailer & then paint them up roughly with thick grey or black pitch type paint to make them daggy looking and less recognizable.