It sounds like from your question you'd rather pull your boat and rent a car. Otherwise you tow your car and have no boat. If you rent a car you have both. I don't have a boat so the decision was easy. Tow it. I would much rather have my own car that I know has not been smoked in, can be packed with stuff and is an extra vehicle in case I get stranded. Not to mention it's free aside from the initial cost of setting it up. At a rental of $50/day (guessing but I'd need a larger vehicle), I'd only have to rent 4 weeks to equal the cost of my dolly.