"Those trailers are designed with a rigid mount and a swivelling tail wheel...That has the potential to completely wipe you out!..."

Note that this is concerning single-wheel auto trailers, which were configured completely differently from single-wheel bicycle trailers. On the auto trailers, the trailer can't swivel relative to the car, but the wheel on the trailer swivels relative to the trailer. On a Bob-type trailer, the trailer would turn on a shorter radius just as described for a normal auto or truck trailer.