So now I'm looking at used MkIII's (gee thanks). I came across this listing, which I share only because I think it's hilarious when the seller says the amp weighs at LEAST 4,000 tons.
(A conservative estimate IME.) Funny guy gets free PR LOL:
One of the most important amps Mesa Boogie's history, the Mark III launched in 1985 and brought a third "crunch" channel the party, offering even more versatility to an already-winning formula of paint-peeling volume and a wider range of tones than any of the mass-produced amps of the time. Sligh...
reverb.com
P.S. The amp is gorgeous, and if I were in LA I think I might actually go buy it. Despite being a notorious
spendthrift cheapskate. (Turns out I didn't know what "spendthrift" means LOL.)