Just provide context on the mooring over lashing to the dock:
1. Since your not there you can’t align the boat on the leeward side of the dock based on wind direction, so you run the risk of the boat bashing against the dock, damaging the dock & the boat.
2. With 60 mph winds you could easily have 2 ft swells - which will act as a hydraulic lift when the swell lifts the boat where the force generated is from the water pressure applied against the wetted surface, so my concern is that could pull the dock apart. Maybe that’s not the case if the fetch (the distance the wind has to act on to induce waves) isn’t that big?
Putting in a proper mooring would cost maybe $1000? all in for a professional diver to put it in, but will absolutely handle storm potential you have as a worst case scenario.
For me, peace of mind is worth the extra $$ to me given I am 3 hours from our lake house.