The heavy hydraulic doors of the Helix transport van hiss open, retreating into the walls with a dull thud that echoes through the cavernous main hall of your home. For a long moment, there's only silence, punctuated by the whisper of the high-end air filtration system. The light from the hall spills into the dark interior of the van, outlining three shapes that are fundamentally wrong for the confines of a vehicle, no matter how specialized. The first to emerge is a thunder of hooves on the ...