check your local laws. Chances are... you won't be legal with 2 people on a tube. Some states differ... but the USCG rule is... driver, spotter, and you can only have as many riders as the capacity of the boat. Since you have a 3 person ski... you can only have one more person. The reason for that is... if there is a problem, and the rider needs out of the water... you can't over load the boat.