How to calculate turn radius of fifth wheel for new driveway

Puddles wrote:
Over the years, watching trucks running up on curbs... dropping off the edge of payment while trying to make a turn... I'm not sure I would trust any calculations provided by any highway engineering firm...

I agree to an extent, just because something works on paper doesn't mean it will in real life. A lot of it is the skill of the driver in a tight turn, Some drivers can nail it every time and others can't

Dan