Walt,
I do admit to being an "enginer". I'll post my free body diagram at the risk of getting ridiculed off the board. It's been a long time (late 80's) and I am beyond rusty, though it is fun doing these things. If I am being a PITA, please let me know - it is not my intent. Mostly I'm trying to learn from everyone here on the board....
There is a term that increases force based on spindle length and kingpin inclination, but it appears that it would be small.
That assumes I did everything right, which I would not bet lunch on.
?????