From :
http://216.239.53.104/search?q=cache:ea3P_y3510QC:www.nas.edu/trb/publications/millennium/00137.pdf+dirigible,+future+airlift&hl=en&ie=UTF-8 "Future Airlift PlatformsExtensive research and development is under way by commercial industry to improveairlift capabilities. In addition to the new C-17s, airlift assets could be improved by the useof modular heavy lifters and ultraheavy lifters (UHLs). UHLs are a combination dirigibleand airplane with a speed of 120 knots and a payload of 500 tons. If commercial demandjustifies it, heavy lifters could be on the market in 2004 or 2005. DoD has not yet investedin this technology but is actively engaged in assessing its capabilities"
So how many do you need to life an armor division?
LOL! I haven't done all the math, but a swag would be about a dozen to lift an armor battalion lock stock and barrel. Looks like it's a lot closer to reality than I knew.