Too heavy!
At 60lbs it is just too big, heavy and awkward to take off the dinghy, easier and more convenient to leave it on. I like the suggestion of tying it tight to stay aligned with the dinghy while towing in the down position though, I'll have to try that sometime. I have seen dinghies being towed at considerable speeds by other boats and I have towed mine at 8-10 knots on occasion but it also requires closer attention. It is not such a problem in protected coastal water but I would not try it in the big rough stuff. It would take a fairly big wave to flip a dinghy methinks.
At 60lbs it is just too big, heavy and awkward to take off the dinghy, easier and more convenient to leave it on. I like the suggestion of tying it tight to stay aligned with the dinghy while towing in the down position though, I'll have to try that sometime. I have seen dinghies being towed at considerable speeds by other boats and I have towed mine at 8-10 knots on occasion but it also requires closer attention. It is not such a problem in protected coastal water but I would not try it in the big rough stuff. It would take a fairly big wave to flip a dinghy methinks.