For insurance purposes we have a Bulldog QD33 but on the other wheel I have my own design wheel clamp and this things weighs about 30kgs on its own and is made with steel between 10mm and 25mm in different areas.
And also made my own hitchlock which completely encases the hitch and also has a lock box for the padlock to stop any bolt droppers getting to it.
Elected to make my own in the end as the off the shelf options are very expensive and also in my opinion not very secure and I can find a quiet and reasonably easy way round the supposedly sold secure.
For this very reason I use this chain for securing my motorbikes as it does what it's suppose to do and be pretty much impenetrable to an extent.
Almax Security Chains Limited
Watch sold secure/thatcham chains get beaten very very quickly
Non-Almax security chains for bikes vs Bolt Croppers - YouTube