gota be careful on rivers with other boats.....i know what you mean about the big ones.....and bajas cruising around 70-80mph.......man i love the sound of them things though!!! you should hit a wake from a BARGE!.....i did it on tubes and knee boards.......tube one time i hit a wake that was 4-5 foot high.....i was about 10foot in the air...landed it the first time...my uncle came back through and let me hit it again......i was about the same height...but the tube wasnt under me after i hit the wake!!!! man did that hurt.......but the boat was fine and would go right through the wakes at the right speed and angle..........some of them boaters are plair careless though........we tipped jetskis a few times because they thought it would be funny to fly by us and cut us off.........