As a long time canoeist and kayaker, plus the owner of an outdoor shop when people talk to us about putting their boats on top of the trailer we discourage it. My wife and I camp and we found regardless of where we went we would set up camp and then want to go kayaking. We were faced with how to get the boats to the landing. Sometime that was a distance away. It is way more convenient to have the boats on top of the TV, drop the trailer, set up camp, and then go kayaking. Bikes and skis were never an issue as most of the time we left from our campsite. The kayaks were a different story. We are really glad we went the route of the TV. We own a couple 14' roto kayaks and 17' FG kayaks.
Do not go where the path may lead, go instead where there is no path and leave a trail - Emerson