post from ASB Insurance. State have the same list on their website, so I suspect all the insurance co's will be the same. However, notice the wording - 'preferred'.
I’ve got ASB boat insurance. What type of security will I need for my boat?
Last Updated: 18 Aug 2016
If you keep your boat parked near your home, you should use a tow-lock bar or anti-theft device. Our preferred methods of securing boats, caravans and trailers are:
- Ross 600 Trailsafe
Klamp It wheel clamp
Ark Trailer Lock - TE12ATL15
SAS wheel clamp
Trojan Sentry wheel clamp
I use the Trojan clamp myself
Don't be alarmed when you see me talking to myself, I am getting expert advice.