Well, if a person has a multi-battery bank, and a typcial OEM converter-charger, they ARE going to have to run the genset throughout the evening or some similar period, to charge. So that one shouldn't be surprising.
My first mod to our new Class C is going to be a good converter.
Since we like shade, and since our 2x50w folding kit stores in only 2' square by 3"thick, and since I own another pair of those in a box, I'm going to make up the second pair as another portable kit.
Then I'm still going to put some permanent wattage on the roof. If I decide simply by dollar cost-benefit, it would be either zero or one panel. But sometimes we do things just for the luxury of it, so if I go that route, my current thinking is, I will put 300w. I mean, once I'm rigging up for any permanent panel, it's not that much more work or money to add another panel or two, IMO.
I reserve the right to change my mind a few more times. :)