OK, I measured the turning radius for my F350 long-bed crew-cab. In the document, the turning radius of a curve was shown as the inside radius, so I looked at the inside track of the front tires with steering at full lock. The radius was 24 feet. The track of the rear tires followed a tighter curve, 4.5 feet inside the track of the front tires.
That means it is possible for my truck to follow a curve having a radius of 24 feet provided there is an additional 4.5 feet of pavement on the inside at mid-curve for the rear tires.
The trailer tires will track further inside, but I don't have any numbers.
So it seems that a curve of radius 50 feet is actually not so tight. For that curve, my truck's rear tires will track closer to the front tires -- maybe about 1 foot inside? I still would like to know how much additional pavement is needed inside the front tire's track to handle the trailer tires.
That is something we have to guess at every time we make a tight turn at a street intersection and try to miss the curb with our trailer tires.
