Hi Rocket Dog
Posted a general reply but happy to share any further info, I would think the hitch wold handle a wave runner no problem - whats the weight/ tongue weight?
The shop where this is made are tiny and I think are easily overwhelmed but seem to do good work , I had a chance to drop into them whilst in CA and they had a bunch of cool projects they were working on. He used to fabricate race car parts and off road vehicle cages