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Same thing happened to me only on flat ground with a standard ball hitch.
Went to Off Road height, put down the jockey wheel, then lowered the car.
The ball just hooked into the hitch slightly & I ended up with 1 very bent & mangled jockey wheel.
I now just wind up the jockey wheel so if it hooks I can just wiggle the trailer to release it properly.
Jonesfam
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Thanks everyone for comments and tips.
The idea to disconnect the ball and lower the car (but don't move the car) is a good one. Although it would not apply to my Tregg off road hitch.
I have a Traxide battery isolator (to be fitted as soon as I get around to it) to protect me from flattening the car battery if I leave the Anderson plug connected to the trailer battery overnight.
Most important lesson: Don't lower the jockey wheel and leave the trailer connected to the car for any length of time. :spudnikconfounded: