From what I have read this seems to be one of the best on the market. Expensive yes but cheaper than a new trailer. The link is for the bulldog coupler.
https://www.amazon.com/gp/product/B...NEZY6&linkId=0c92072d17acfeee97d5c332cec42880
http://www.amplock.com/u-brb2516/
[video=youtube;biP06Lgrrhc]https://www.youtube.com/watch?v=biP06Lgrrhc[/video]
These proven locks might be an alternative. Shouldn't be to hard to make either. You an buy the lock separately.
http://provenlocks.com/t/puck-locks
https://www.youtube.com/watch?v=NMu_GnNnnBE
These look pretty good as well.
https://www.ftknoxlocks.com/our-products.html
https://www.youtube.com/watch?v=WbI6M-9NWR4
Of course if someone wants your trailer bad enough they will get it with enough time and the right tools.
https://www.amazon.com/gp/product/B...NEZY6&linkId=0c92072d17acfeee97d5c332cec42880
http://www.amplock.com/u-brb2516/
[video=youtube;biP06Lgrrhc]https://www.youtube.com/watch?v=biP06Lgrrhc[/video]
These proven locks might be an alternative. Shouldn't be to hard to make either. You an buy the lock separately.
http://provenlocks.com/t/puck-locks
https://www.youtube.com/watch?v=NMu_GnNnnBE
These look pretty good as well.
https://www.ftknoxlocks.com/our-products.html
https://www.youtube.com/watch?v=WbI6M-9NWR4
Of course if someone wants your trailer bad enough they will get it with enough time and the right tools.