Originally Posted by Hightower
If the rams can cope with 150hp or whatever pushing a tonne of RIB in and out of the water, then a few little bumps in the road on a suspended trailer won't be a problem.
The difference is in direction. When in the water and underway, the prop force is all in one direction.
When trailering, the motor is being bounced backwards and forwards; something the transom normally doesn't see too much of in the water.
Plus, depending on how far you trailer, it's a lot more than "a few bumps".
But, hey; it's your rig. Not saying you should use one; just stating my reasoning.