It seems to me that a single Yamaha EF2400iS generator may fill the need of a TM owner. Look over this website for an evaluation of this model - scroll down to his "Alternate Energy" section to find his EF2400iS evaluation:
http://2manytoyz.com/
At $1,099 each Cabelas seems to have the lowest Internet price I can find for the Yamaha EF2400iS at the present time. Cabelas also has a $4.95 shipping offer that's only good for a few more days. It expires on 3/18/08. Insert the shipping code "38FLAT" at checkout to take advantage of the low shipping offer. In my experience they're an excellent firm to deal with.
Larry_Loo