I cannot say anything bad about BoatUS insurance. I have the angler package with unlimited towing for inland, international and great lakes waters. Runs me a little over $500 for the year and it covers tournament entry fees, trailer assist, towing and coverage for $25k for the boat/motor, $5k for the trailer....
I have had one towing claim and one engine claim and service was exceptional. 24 hours a day on a 800 number with local surveyors and towing comanies used.
I highly recommend them....