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Originally Posted by freebeard
Do you have pictures or additional hand-waving to explicate this?
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In the side view, the kingpin axis is vertical, and the spindle is offset to the rear by the amount of trail desired.
In the picture the top left feature is the spindle hole, above the steering rod. The ball joints are in the middle, and a rim brake is mounted on the right. There were no apparent complications. Mike Burrows has also used it on a bicycle with no problem.
The use of caster angle instead is a holdover from the earliest cars, which did better with the camber angle this produces in a sharp turn. You can see this taken to extremes now in road graders. It also reduces bearing loads a bit, but now it is somewhat a liability, trying to keep a wide tire upright.