My detachable towbar was fitted by a specialist in a workshop who offered a thoroughly professional service. I had to answer certain questions beforehand, including what I was planning to tow. It seems that some detachable towbars are not rated to pull certain loads, which I never realised and perhaps this is why they fail. Also the firm took into account the common fault where the electrics neither charge the caravan battery nor run the fridge on 12v when towing and the correct harness was installed. All good, no problems. I only detach it in the winter and it is lockable to prevent theft. Had this one for five years and have been towing for thirty-five years.
2015 2.2 CDTi SENav 163ps manual 4x4 in Carbon Flash with 19\" alloy spare towing a Bailey Unicorn III Madrid @ 1500kg.