If my camping routine only required flashlights and candles then no problem haha... We normally see around 20AMPS DC CURRENT being pulled on a continuous basis from our battery bank between the hours of 6PM and 11PM running all of our 120VAC toys... This doesn't take in any heating items - just toys...
You sound knowledgeable about RV DC power...what toys are you running to draw a continuous 20 amps for 5 hours? I'm glued to a laptop, watch DVDs, TV, audio gear, charge all forms of small batteries and I'm nowhere near that. A small fraction of that. The demand side is a very productive way to get more bang for buck of the battery and charging system. 10 watt laptops, 20-25 watt TVs of remarkably large size, LEDs with 70 plus lumens/watt..such fertile ground..
To the OP- I highly recommend solar power but only if you're camped in the sun. Some locations are so shady it would be reasonable to de-prioritize solar power for that alone.