Generally speaking: keep away from any insurance company that handles PSV business...unless you also just want to insure your PSV.
Still, isn't this an indicator that the premiums charged are too low? When setting the premium, the actuary mus incorporate the cost of fraudulent claims... the excuse that this is difficult to do is simply a sign of laziness!
Nothing is real unless it can be named; nothing has value unless it can be sold; money is worthless unless you spend it.