I think we need a little clarification of terms here. (Tweakyjeep, this means you!)
Panhard bar = track bar. They're the same thing, a link running parallel to the axle to locate it laterally. (side to side)
Traction bar is a device to limit axle wrap, most often used when the springs are on top of the axle. (but not always)
PierCed_3, you never mentioned what type of vehicle you have, but based on your comments I'm assuming it's a CJ/YJ. Either one of those, the track bar is somewhat redundant. I can't tell you to take them off, but if the rig was mine, I'd toss 'em.
I've never heard of anyone breaking leaf springs while towing, due to the lack of a track bar, that's a new one on me. I CAN see the need for a traction bar when towing (and at all other times too!), if you're going SOA. There are no disadvantages to running a properly designed traction bar.