Wow! I have heard nothing about an inverter, and I can't find any reference to it on the TM web site. A 3000-watt inverter would draw a minimum of 3000w / 12v = 250 amps out of a 12-volt battery, which is on the edge of impossible. Where did you hear about this?
As for "evolution cycles", I have only about 7 years experience with TM, so take this with that in mind. My impression is that before about 1999 or 2000, each TM was pretty much hand-built. Design changes happened, but were sporadic. There was a big surge of design changes in the 2002-2004 time frame, and then things settled down for a bit. Another surge occurred in the 2007-2008 time frame, as they geared up for the 25th anniversary.
Again, this is just my impression. Others may disagree, with no more evidence than I have presented (that is, none!) But the basic concepts - light weight, foam sandwich construction, fold-down shells, torsion bars, reasonably standard amenities and appliances - have been constant since the beginning.
Bill
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