I agree with others here that an old wash machine tub is the way to go. It gives off a lot of heat all around and burns more efficiently with the mixture of air that it gets. I have used them for 25 years or more.
I always had the big ones that I put in my trailer with the desert buggy and quads. I found that after I sold all my toys plus the trailer that is was a pain to take that large tub in the motor home.
So I started looking for an alternative to having it but found that nothing worked as well that wash machine tub until........
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I found this. It is a wash tub from a compact machine. The cooking grate from a Weber Smokey Joe fits perfectly.
As you can see it is smaller,13 in. across VS 17 in. on the big one and 14 inches deep VS 17 in. on the big one. It stores easily in my rear compartment. I even found a canvas bag that it fits in so it doesn't make any mess while back there.
It still makes a helluva fire and the firewood fits just fine.
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The son in law, daughter and grandkids now do the Toy Box thing and I just kick back, grab a Long Neck and watch the excitement....