With Redpower 2 pre3 you can load/unload storage minecarts... I had a setup that moved both RE's and Lapo's around via minecart. Very efficient and I actually considered replacing large sections of my longer distance wiring with minecart tracks. Bugs in the system (read: Animals on the tracks) made me reconsider
*snerk* "bugs in the system" nice. You could always build a elevated rail line. (whee! cobble generator, a block breaker and a timer)