2.5/2.6 draw bar hitch question

So I’m thinking about making the switch to a draw bar style hitch but not exactly sure on a couple things.

Here’s the rules. “Receiver or draw bar style hitch permitted. Receiver hitch: The receiver tube must be horizontal/parallel to the ground and stationary in all directions.
Reinforcements are permitted. Any hitch attachments/bracing must be from frame down, not axle up and cannot extend forward of the center line of the rear axle, and must remain inside the frame rails. No part of hitch can be above frame rail. Trick hitches are prohibited. Bumper may be notched or removed. Draw bar hitch: Must be stationary in all directions, frame mounted and forward mount can be no farther forward than centerline of rear axle. Hitch can not exceed 25 degree angle from pivot point to hook point. No hitch supports or adjusters fastened to rear axle housing shall be above center point of rear axle. Pivot pin of drawbar can be no further forward than the centerline of rear axle. Safety hitch mounted 12” below primary drawbar, minimum 3/8” thick.”

What do they mean by “safety hitch mounted 12” below”?

The safety hitch is a 2nd stationary hitch for a 2nd smaller chain on sled to hook into. If you Google draw bar pulling hitch you'll see plenty of pictures. It's just eaiser then uploading a picture through my phone. Hope this is of some help to you