I was once driving in the rain and my 27ft TT started hydro planing and sliding into the right lane.i used the trailer brakes tapping and holding but it kept pulling. When it started pulling the back of the truck over I let it until the two were aligned again and then I lightly hit the gas and pulled it straight forward. I used all four lanes of traffic going in the same direction without interfering with traffic in the opposite direction. Fortunately everyone saw what was happening and gave me room. No harm no foul and it has never happened again.