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Duplex Steam Locomotive / Steam discussion

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Well, here's another slight deviation from the discussion, but the mention of the "double" Belpaire boiler in a few posts (which needed a three axle trailing truck) and the height restrictions of the Niagra and the J's of 15'+, all brings a new question to mind: With today's 20' max height on most mainlines, could it have been concievable for a large firebox design such as the Belpair to ride ontop of a second set of driving wheels? E.g. getting the necessary steam quality/quantity necessary for superpower steam, while at the same time keeping most of the locomotive's weight on the drivers. I know this is getting to be an abstract beyond most of your interests, but bear with me for a moment. Take the J with the 70" drivers. That's a tad under 6 feet, and we'll assume it as the minimum for speed/drawbar pull optimization. For a 20' clearance, that leaves 14 vertical feet in which to place a large firebox, so let's settle for a max height of 19 feet and 13 vertical feet of firebox to be safe. 1. Is 13' of vertical rise sufficient space to place a large enough firebox to produce the desired steaming quality that superpower loco's demanded? 2. Given that a high riding firebox would negatively alter the loco's center of gravity, what more would be needed to keep the COG in an optimum range? 3. Other than for firebox support, did superpower steamers need to have a trailing truck for stability, etc.? If there is room for affirmation to some degree of those three questions, then why not a duplex 4-6-6-0 with the same length of frame as the J's or the Pennsy T1?
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