I have a 2011 Gti 130. Just 3 weeks ago we went skiing and wakeboarding. Me, including my mates are all in the 100kg region. With wakeboarding and skiing with 2 ski's we had no problem to pull each other out of the water. Once on the water, you could kick out one ski and actually slalom. I would expect that with a 155 you would be able to pull a 12-16 year old with no problem at all.