I am sort of confused (don't all groan at once!).
When I take Farfetched any distance, I have a ratchet strap at the back, and the bow is attached by the ratchet strap from the trailer, and by the painter. There is a safety chain over the ball on the car as well.
When I drive the 500 yards from Berton to the Lymington slip, I am not using the rear ratchet strap, just have the bow attached to the ratchet strap from the trailer, and by the painter. I do use the safety chain over the ball. In this latter case, my speed does not exceed 20mph.
Am I taking any inappropriate risks?