When we hired our campers we used cil as they were the only ones that covered hire campers. We sent them to the Cape 10 times a year and had 2 campers written off and they were covered plus gear we had inside up to $1000.
I can only speak about our experience and as they say always read the PDS about any insurance company. They covered what ever the kilometres were to get the campers back as it's $1000 to tow a camper from Coen to Cairns.
I have insured my camper with them due to the great service we received. As I said I am not here pushing their product but just my experience and yes there are a number of good insurance companies just make sure they insure what you want and where you travel.
Mark