Oldie Moldy wrote on Jun 18^th, 2012 at 12:52pm:

Right now I'm working on a set-up (on the littlbug) where I spread four or five nuts between the two cake pans leaving an air gap of about 5/16".

Perhaps I'm a bit more weight conscious than you, but the I too use a spacer between flat surfaces to add a gap.  On my recent trip I used this method to cook cake/muffins via the "steam vat"method.  I placed the item to be cooked into a shallow (cake) pan and then placed that pan into a pot containing perhaps a 1/4" of water and resting on the spacers.  The steam actually cooks the item, which isn't browned, but EXTRA moist!

Oh.  My "light weight" spacers ... small flat rocks I find at the campsite.  I don't actually carry the spacers and if I loose one, there is usually another close about.  (Like the twisted cord clothes line, its a trick I picked up from backpacking.)

dd