trailer jack on a tow dolly

Where do the toad's wheels sit on the dolly in relation to the dolly's axle? Ahead means you will have at least some tongue weight and a jack is a possibility. Directly over the axle is anybody's guess. Behind the axle would mean you get your "summer teeth" if you tried to unhitch. As in, "summer" here, "summer" there after the tongue pops off the ball and catches you in the face after you release it.

HOWEVER, I'm confused here. You're very concerned about going "by the book" on the leveling, but ignoring the book for the tow dolly.