MM49 wrote:
Your friend might be making the best move possible decision for dry camping. The most important feature is weight capacity for the battery bank. If you can carry the weight in the correct position on the rv the electrical design challenge can be solved. Every rv has its weight limits to how much battery bank can be carried. My rv is a TT and the most battery I can carry is two on the tongue. Any more and the vehicle stability is compromised. Motorhomes have it made with the weight carried between the axles.
MM49
This assumes that batteries must always be carried on the tongue. With the advent of AGM, battery location isn't restricted to the outside of the TT, you can put them in any location.
I run a residential fridge (small dorm model) with 300AH and a single 235w panel. Average draw is about 40 AH/day. It can be done.