if you are still in the design stage, consider moving the front wheels up where your feet will be. this will obviously make the trike longer, but at the same time move the weight distribution more between the front and back wheels, giving the rear a bit more usefulness in braking power.
On my Anthrothech, I get this redistribution of weight almost automatically during long touring because of all the gear I carry (tent, sleeping bag, water, clothes, tools). I use front and back braking regularly to keep wear-n-tear more even all-around.
Alternatively, if you have enough 'junkers', you might consider building up a quad (4 wheeler). The Steintrike people have a quad (
recumbent quad cargo bike full suspension on Flickr - Photo Sharing!) and there is Utah Trike's Quad (
Utah Trikes - 2010 Extended Quad), along with several others you can find through a web search for inspiration!
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