Sink a ground anchor into concrete and chain the axle to it. It also means if you park it somewhere else you can put the chain through the wheel and chassis leg so it can't be towed.

On the downside it's a pain to do every day.
 
Thank you for all responses, loving the anchor in cement then chain......... quality!

So going for Cobra alarm and Imm, DiscLok and SkyTag Tracker.

Regards

Def1383
 

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