I just bought a 1988 Seaswirl Ski boat. it is equipped with a ski pylon, I noticed it has a sticker on it that says "Do not use for inflatables or tubeing or warranty will be void." can anyone tell me why? just seems to me if it can pull a 200lb man on skis it can pull a 100lb kid on a tube. I was planning on useing the tie-down "D" rings on the transom, but I was just curious why the sticker is there.