Class B have been pretty much the leader in lithium batteries because they are the RVs that have the reputation of going anywhere which leads to more off grid living opportunities. That's just my opinion and observation. The larger motorhomes just assume they are mostly going to campgrounds to hook up to shore power. The Volta 56v lithium system is the top of the line and Advanced RV and Winnebago offer it. There are many 800ah lithium systems which reach the limit for other battery systems like AGM lead-acid mainly because of space and weight limitations. So, yes just about everyone is offering lithium battery systems from a minimum of 200ah in 12v batteries up to about 800ah. So, in a nutshell Class Bs have just about anything you want in lithium ion. Don't ask me about voltage, watt hours and amp hours other than to say that Volta systems offer more power than most all the 12v systems. As for needing that power the next question and answer is you can run air conditioning all night. That seems to be a holy grail to seek. Almost. I don't worry about it living in Minnesota and going south in the winter. A Floridian might have a different take.
Class Bs have about 60 sf up to about 90 sf depending on length behind the cab area. There is not a lot to work with. Thus a wet bath meaning your bathroom is your shower with a toilet protruding in it mainly to save precious space. There have been some attempts to have a separate shower room but if you want one then 30" square is a minimum or you are wasting a desire. With narrow Class B's there is a limited way to get a 30" sq. shower in. Wet baths are not bad. It is perhaps the best way to keep a bathroom clean and you generally have a wrap around curtain to protect the walls to eliminate wipe downs. I'm in the process of designing a a 31" x 38" wet bath with a toilet intrusion but not where I would stand and throw out my elbows in one of the smallest Class B on the market, a 144" WB Sprinter. It will be a custom design first. So, I guess all things are possible. You are not going to take a traditional style shower that you might have in your home standing under a powerful stream for 5 minutes in a wet or dry shower situation.
That's my take. You are going to look at Class Bs that are mostly either/or situations or night vs. day mode, aisle showers, doing your business in you kitchen and the gamut of Swiss Army Knife thinking. It's a challenge in ingenuity. I have been progressing toward designing non-convertible uses and spaces. The only area I break this is utilizing the cab seats in a turn around mode when parked. That cab area is a lot of precious space not to use.
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