I have a North River and tow with the top up if I know I will not be going over 55mph. I discussed this at the time of sale and it was stated that it all depends on how long you wanted the top to last, one to three years, or 10 years if it's towed top down. If I do tow with it up, the side curtains and the back drop are in so it is tight to the boat and wind isn't whipping in and out. I also purchase the tonneau cover that completely cover the boat for storage and it's good on the freeway. When you get to your destination just install the top and side curtains if the weather's nasty. My boat goes 55mph, so I figure if it's fine on the water it should be good on the highway also.