Advice needed re: quad

[ellectrastar]

I’ve recently bought a property with land and am in need of a quad. Is there any way to ascertain an idea of value when looking at ones for sale? I’ve seen them at varying prices but don’t know how to judge what’s good value. I need one around 450/500cc as it has to pull a loaded trailer.

Also looking for advice about insuring. A lot seem to be road-registered now, although I wouldn’t plan to use it on the road, only on the land. Are there any recommended insurers? As it’s not going on the road I would really only need to insure against it being stolen.

Lastly if I’m using it on my land would it be exempt from road tax?

Any help much appreciated