Don't know about Dodge specifically.
But, where the two brake shoes are anchored at one common point, and the other end of the shoes are touching the wheel cylinder, EG, there is only one wheel cylinder for the brake - one shoe is what I'd call a leading shoe and the other trailing.
If you imagine the brake drum turning counter clock wise, and the wheel cylinder being at the top - then the shoe on the left side of this imaginary picture is the leading shoe. It does most of the braking since the rotation of the drum tends to self apply this shoe. Since it does most of the braking, it will also wear the fastest.
My guess is the thicker shoe goes in the leading position.
Does that make sense?