I've only ever used heat beads on the top of mine, and from memory I put about 6 of them and they last the couple of hours it takes to cook the roast.
I sit the camp oven on a small wood stove/bbq (home made "OzPig"), so I don't know how many you'd need under the oven.
I've got a camp oven book at home that shows how to cook using only heat beads. I'll have a look tonight and see if it says how many.
When you say its a lot of weight I presume you are meaning the cast iron camp ovens? If so, you might want to consider a spun steel one - much lighter. Not suggesting you buy one specially for the trip, but you might be able to borrow one...
Steve


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