How do we repair this oops that hubby just made?

A guy who is good with fiberglass will have no problem fixing the hole. If there's no qualified RV repair shop nearby, look for an auto body shop near a lake, they will likely have experience repairing smashed jet skis. People are always hitting docks, swim platforms, and other jet skis with those things, usually at fairly low speeds, and they end up with little crunches, just like your coach.