I am SURE you are going to get some interesting opinions! So, here are a few of mine! We have a 2021 2600RB so that is what I am talking about.
#3 . We live in Texas and we only have one AC which has been enough...even in 105F daytime temps. If we were living in the TT for long periods of time we might want more. So I guess it would depend on how you are using the TT.
#4 . Two AC units would definitely require 50 AMPS to run them at the same time...especially if you used any other appliance such as the microwave or hair dryer.
#7 . We like the rear shower since it seems to provide an uninterrupted living area with lots of storage.
#10 . We use an WDH and I don't even know the brand. My suggestion is to get one that is easy to use!
In summary, we love the unit and have pulled it around 10,000 miles in the last 12-months. I have a collection of accessories that I carry to allow for versatility and comfort such as a 30A to 50A adapter so I can hook up anywhere.
Good luck!