I use an average of 25 amp hours per day, although if I'm doing a lot of photo editing & make a pot of coffee, can go as high as 50 amp hours. 2 - 6V 232 amp hour batteries.
I started with a 95 watt GoPower package (supplied by the trailer manufacturer) & during full summer sun, and no shade, had no problems dry camping for 2 weeks. (I don't carry a generator). Low angle winter sun or shade requires limiting usage, so I added a a 160 watt portable folding panel from Solar Blvd.
While the folding panel adds enough to keep up even in the winter or shade (as long as I move the portable into the sun), I decided to add a 100 watt roof panel for convenience, as well as not having to worry about a portable panel while I'm away from the trailer. I'll still carry the portable in case I'm parked in the shade...