If you could deal with the integration of the engine management hardware of a Tahoe hybrid into your Suburban to use the Tahoe's hybrid drive system, that would probably be the most straightforward option, altough might be not so easy to find one for scrap. On a sidenote, this system was also used by other manufacturers, most notably Mercedes-Benz for the S-Class and ML-Class.
Anyway, you should check this thread to take some inspiration:
http://ecomodder.com/forum/showthrea...uck-22080.html
Well, I guess if you retain the IFS you'd have more options for the electric FWD setup, eventually just using a direct-driven motor without a front differential, basically to provide auxiliary traction in rough terrain or for heavier towing.