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Contentious issue, rules change if GVW of trailer is over 3500k. I have tried to attach factsheet from DfT which may help. Calder Leisure supplied me with a device that locks the wheels externally and can be mechanically locked in place.If attachment does not work the link to Dft website iswww.dft.gov.uk/pgr/roads/vehicles/vssafety/factsheetamericantrailer.pdf
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john thats not quite true most trailers have a cable handbrake .also the air doesnt always take the brakes off on ,many can be driven with no air. mine as a system where the air is stored in a tank on the trailer when i apply foot brake air then goes to a relay actuator that dumps air to the brake actuators and applies the cable operated brakes . i did have a bar system but it kept falling apart when used off road.
now trucks on air do have the systen you describe. you must wait for the air to build up before you can drive off .
you only need a handbrake on one axle .