I am with Shannon's, i have insured other cars with them before and had to make two claims (neither was my fault and hopefully I don't have to make any more claims in the future!), and they were really good to deal with both times. Their premiums are comparable to other quotes I got, and they cover me for the agreed value of my truck and accessories. (Even my fridge since it's fixed in the vehicle).
The cover was explained to me by their rep quite simply. He told me to think of it this way, if I haven't paid to be there, (like a competition), and I am legally allowed to be there (not trespassing etc), then I am covered. Way better than the old gazetted roads only cover I had previously. Just my opinion...