Denny - It sounds like you are well on your way to a Masters degree from both Google U and life school of hard knocks.
I know I got a lot of flack for 400 watts of
solar panels that I permanently mounted on the roof of my
Casita but I designed it to work in the real world conditions that you described (clouds, sun angle, dirty panels and shade from trees) When I mounted the panel I tried to position them so that I could collect the suns rays from all angles knowing that I wouldn't always be able to position the trailer for optimum collection. At any given time I estimate that I have 200 watts of panel in the sun which seems to be just about right for charging our 2 - T105s in a variety of real world conditions.
We have been cross country 4 times and I am 3+ years into the life of my batteries (I estimate 8+ years life) I have not seen less than low 70% charge and we are heavy
electrical users even when
dry camping, which we prefer. The only time I check the monitor anymore is when we experience more than 2 days of poor
solar collecting. I disconnected the converter in our trailer when I installed the
solar so even when we do have 110v hookups all of our 12v comes from the sun (the converter I had was a NG single stage charger)
I know that my setup is not perfect for everyones needs but it works for us.