PMG is Permanent Magnet Generator - it is a small generator on the back of the main alternator that supplies a separate power feed into the voltage regulator that is used as the drive for the exciter so you have less of a voltage dip when a large load is applied. The Sales guys from any genset company should be able to fill you in on the details.
I'm in the hire game, so unless you want a price for a long term rental unit, then I can't really help. I probably shouldn't go spruking my wares on here anyway.
We use a lot of FG Wilson units in our fleet - they are a Perkins powered unit and are reliable and competitively priced. Distributed by Allight in Australia. (No connection to them, Just another thought...

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