I am looking for a couple good books on RV solar

First off, I have googled solar and several variation of that and I find that there are too many highjacks for my Dyslexic mind to follow. I can sit down and determine what my average daily load is without using any 120vac and I know I would like two more batteries but space is at a premium in my rig.

So I am looking for a simple book or publication that I can use to determine what I may need before I ask for help picking out the most efficient system for my rig. I can read and figure stuff out but most posts as I said get hijacked with personal opinions and I looking for a place to start and then help and opinions.

TIA