In my old neighborhood there was a guy who brewed 10gal batched on these. Keggles went on top, burner went below, with the flames shooting through and heating up the metal. As far as i know he's not dead yet as "only" the central support "spar" is red hot/useless. Overtime the wire grid in the flame area have been distorted but the load seems to have been picked up by the front and rear spars.
I wouldn't do it.