

I believe some motorised trailers use a sensor in the tow bar to detect if the tow bar is under tension or compression. Under tension, increase the throttle, under compression, decrease the throttle. They also might have brakes which could be applied under strong compression.
I’ve never used one myself though.










Yes, seaweed is good, and widely used where I live (Also not an expert though). It’s best to let the rain wash some of the salt away first though.