Here's my 2 cents. I run solo and have not had a big need for a genset. If I were to buy one I'd get a Rigmaster, but it would be a luxury, something teams can afford.
I liked that little calculator- fun but it's just numbers and not "the real scoop." If gensets were the greatest things in the world every tractor you saw in the truckstop would have one, but they don't. Biggest reason is you are adding on a complex system to purchase outright, plus essentially what amounts to an additional little truck to maintain. And when it doesn't work, it's a hell of a novel paperweight. Plus once on the truck, you are going to have to do some explaining if you decide to take it off- they are designed to be permanent.
I idle a lot in the summer heat. This idling does not change my oil change interval, and as my engine has over 600k unrebuilt miles on it so I doubt it has shortened its life much. I wouldn't care if it blew up tomorrow as it owes me nothing. It might cost more in fuel, but it is one less thing to maintain without any added complexity.
In the winter I rarely idle, only in extreme cold. My -30 degree hunting sleeping bag works great, and I just use one of those ceramic 12 volt plug-in heaters to warm up the sleeper when needed.
This sort of climate control setup should be ample for the solo expediter.
-Weave-