Yes Pace beyond doubt one can water ski a wheel equipped airplane and they do.
However when I am asked is it professional I can not think of any time during my career that I was asked to demonstrate the ability to water ski a wheel equipped airplane.
Even when renewing my Airdisplay Authority every year in Europe they never asked me to display that skill even though there was water nearby that was quite suitable for such a demo.
When I put that activity to the risk assessment to the reward test I find it to be not worth the risk......just imagine explaining to any regulatory body why you were doing that if you wrecked the airplane and lived.
How about this for a good show?