Several years ago I had to send my TS6M back to the Supra factory in Maryville,TN. I had a transport driver pick up my boat that had a set up like this one. He hooked my trailer up to the back of the truck and took off down the road at 80+ miles an hour. He had a wakeboard boat sitting on a tandem trailer on top of his truck. He said he was not too worried if he flipped it, it was only a wakeboard boat!
BTW, I went to maryville to check on my boat, the trailer had 2 new tires on it. I asked and was told both my tires blew out on the trip back to the factory.