Hey Scott, this is a great question and a good time to bring it up.
The rules within the Preserve are that fires are allowed, I will check with the Ranger to confirm if there are any restriction.
However, one thing the Rules / Regs mention is that for Primitive or Dispersed camping, no new fire rings are allowed, you can use either existing rock or steel fire rings.
And, for this many people, and you know how much you enjoy a good fire, there are not enough fire rings to go around, almost anywhere we'll camp.
So, by all means, bring your portable fire pits, whatever they are. Propane, washer tubs, etc., those are all legitimate ways to enjoy a good fire in your camp.
Another thing worth mentioning is that any coals that remain must be packed out, and any wood that you brought must be taken with you.
In other words, don't think you're being a nice guy by leaving some wood for the next camper, that is specifically mentioned that it must be removed.
And it goes without saying that fires must be completely dead before leaving.
I did mention for everyone to bring two bundles of wood. You might be packing some or all of it back out, but at least if we find a good fire ring, we can have a ripping good fire that all can enjoy.
Dan.