Just curious if anyone has tried tubing behind a 2 up 60 hp? We have a 10 year old who has been begging to tube behind our Spark, but I have been hesitant because of the fact that there would need to be 2 people on the ski to have someone watching him. Not sure if that would be over doing it? Thinking maybe we should add a 3up to the mix for tubing? Thoughts?