The only companies I could find that would insure my float was AAA and Progressive. AAA couldn't touch Progressives price even though I had my cars with them, but the agent was a hottie so I spent quite a while trying.

All Progressive really wanted to know about the boat other than the ID basics was estimated top speed and was the engine covered. So $400 now gets both my boats insured. And y'all know how fast my boat is (not).
One thing to consider with insuring a boat is that is something happens to it while towing, you are covered. Most auto policies will not cover what is being towed. Just something to think about . . .
X2 on at least getting a quote from Stacy Johnson @ Wozencraft. Besides being all around good people, she calls back when she says she will, and can search thru a number of different carriers.