Well stated bka0721.
You are mainly speaking for the plains areas, high mountain areas, and desert areas for solar usage because they lack trees. East of the Mississippi, seeing anyone with solar on their RV's is like looking for hen's teeth. The land and most CG's are heavily forested with tall pine/evergreens trees and so many kinds of tall very large decidious trees with lots of shade always when the leaves are on the trees and that's when the CG are the busiest. The state we live in is Michigan which is still over 50% forested today and has over 11,000 inland lakes plus over 3200 miles of Great Lakes shores and all around nearly all the lakes are woods to thick forests. Trees mean shade, and that's where most of the CG's are. Forests, lakes/water, and shade is what the RV'ers seek in the east half of the USA.
Solar in my state is virtually useless as it is basically all over the east coast states and the S.E. states also because the S.E. is very hot with extreme humidity in late Spring, Summer, and most of Fall. You'd about croak without A/C on in an RV in the S.E. in Summer. By contrast, A/C isn't even needed along most of the Great Lakes as there's shade, cooler, and far less humidity than in the S.E.
We are in Florida presently for a couple months as we have lots of family down here to visit etc and shade rules here and well placed trees or sites in CG's are there to shade where the RV sits. You'd most likely have to park your RV in the roadway in most CG's to have full Sun 80-90% of the daylight hours. Even the National Park CG's east of the Mississippi are mostly heavily forested.
What works so well where you live or camp wouldn't be worth beans in the east half of the country and also in several of the northwest coast states either. Solar has it's place just like battery banks, inverters, and generators for boondocking or no hookups CG's etc. The area/region you are in makes so much difference! There's about 700 no hookup CG's, most in forests, in my state alone and another couple thousand with hookups where no alternative power source is needed. We've been RVing now for 50 years this year and have been in all 49 states you can drive to and Canada many times in all seasons and the needs for comfortable RV'ing are so different. What works fine in one area is useless in another.
