As for 'surge suppression" ....

This genny is of an exceptionally reputable make .... Think "Mercedes-Benz truck" rather than "economy car" in terms of construction.

(Had I wished, I could have purchased a Chinese import of supposedly similar ratings for about 1/3 the price ... and I got a deal!)

This implies an integral alternator, rather than an inverter. As a quality make, the voltage regulation is likely to be a lot better than that on an economy generator. Does this mean some manner of surge suppression? I don't know. I'm more inclined to think along the lines of diode bridges and capacitors, rather than transistors. I'm not about to open it up and look.