I have found that I now look for spots that say sunny/partial shade vs before solar a shady spot was always preferred.
In a conopy of trees you may as well just get 50 watts assuming you have sun during storage.
I have found many shady spots can get a couple hours of good sun so the "load the roof to the max" option may still work out OK.
Portable I would not bother due to the hassle but others seem to do great with it.
You may not always be able to avoid running the generator. And for the times you can reduce run time by 50% to 100% you may find it is worth the effort to get solar.
In marginal light conditions I believe a higher voltage system + MPPT will give better output.
All with a grain of salt from a west coast camper ;)