Originally Posted by thomas
If there was a risk of buggering the transom through towing with the engine up I'd be really worried the transom wouldn't be strong enough in general, the extra load created by having the motor up towing can't be any worse than bouncing around in a big sea.
With the motor up bouncing down the road is putting forward and aft forces on the transom trying to bend it. Over time, if you try to bend something backwards and forwards it is more likely to fatigue.
With the motor down the forces are more up and down which in my opinion is less likely to fatigue the transom. There isn't the continual leverage trying to bend the transom backward and forward unless you are wave jumping.
When we check for a wrotten transom, we tend to have the motor up and rock it back and forth to see the flex. It doesn't work so well with the motor down. When up it acts as a large lever.
Of course having it down only works if you have enough clearance to the road.