Second the Tow Plan
No first hand experience to offer but I second the tow insurance. My parents came through there a few weeks ago and made a small navigational error, and got VERY stuck as the tide went out, sat on their keel for 8 hours, and then got yanked out. They are experienced and know their way around but the channel marks do get moved regularly so pay close attention and listen to the mariner updates before you head through there. They missed one. Not to scare you, but their bill was over $1000 but they were covered less a small deductible-lesson learned. They draw about 5 ft on an Island Packet 38.