Personally, having been pushed into a skid in my 1986 Cavalier by my caravan, on which I had forgotten to undo the reversing lock on the caravan's hitch, I would not attempt to drive any distance with an unbraked tow load of much more than half the towing vehicle's weight. Even a fully loaded, small camping trailer (no brakes) pulled by a Pug 205 diesel was a nerve- racking business in stop-start holiday motorway traffic, with idiots trying to move up the queue by jumping into the gap I was trying to leave to ease the wear and tear on clutch, brakes and nerves. I haven't seen an A bar used professionally for years -they all seem to use braked, 2-wheel dollies. I did get a tow home with a rigid bar 4 miles of country lanes when the clutch cable snapped on my R19, but I was in the driver's seat, with the engine running, so my brakes worked, and there were only 2 small down gradients.
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