That is what I was thinking in the back of my head. All the cons that
people mentioned would also apply if I were using a locking 30amp
extension cord set that breaks that down to four female extension cord
ends. I will be mindful of what I plug in to each outlet and do my
best to ensure that there is no overload just as I would if I were
running this type of extension cord set through an open window.

Some folks mentioned balancing the load and that the neutral carries
the difference. There is no perfect way of exactly balancing the load
to say 4 different appliances. No matter how well I divide the 4
appliances amoung the 2 circuits, I am certain it will not be exactly
divided. I don't see how this could be a major issue since the
generator manufacturer must know that home consumers are going to use
their product in such a configuration.

wrote:

There's no difference, that I can see, between doing that and running
some 20 amp extension cords directly from the generator. I would use 20
amp outlets -- the best ones you can buy. I, personally, don't ever use
cheap outlets. I like the ones where you shove the wire in a hole and
then tighten the screw.