I've done similar
I tow mine SHORT distances with a Grand Cherokee. I once towed it from one slip to another, about 3 hours, and I'm STILL puckered! The vehicle towed fine, w/tow package and V-8, but when all you can see in your mirrors is hull, and people, including 18 wheelers, whiz by you, there is not a moments peace. I will NEVER EVER EVER EVER again tow any distance without a full size truck! There was a discussion a year ago or so on this subject, and I think the most insightful statement made was that you can do it with that vehicle, and you may even survive it. Then again, maybe not. Save yourself the stress, rent a vehicle, or find a buddy and trade a road trip for some sailing time.