And have over $50,000 in extra change to boot.
The nicest part about having an integrated unit is the ability to navigate most road infrastructure and parking lots. There are a lot of places where it's either no fun or literally impossible to navigate with a trailer. For instance parking in any city-like environment. That includes dinky "cities" of 20k people.
As someone that camps otherwise stock van with a sofa bed every type of camping system has it's advantages, disadvantages, and costs. Show me any type of camping setup and I can tell you why it's non starter for a lot of people. And perfect for others. My take about electric RV's is essentially RV's are all built on a van, truck, or bus chassis. When those become available with enough range you'll see RV's built on them as a standard option.
I also am "full time" nomadic during the summer months, so if I want to stop in someplace specific I do it on a travel day in between campsites.
My ideal setup:
* Class B - day traveling and occasional overnighting. For example, being able to pull over just about anywhere for a nap while driving.
* Small Trailer - Camping equipment, shower, beds, etc.
I have a class-b sprinter RV (4x4). It wasn't cheap and diesel isn't particularly cheap either. However, I can camp a number of places that would be next to impossible with the setup you mention. I will grant you, some of the places I am thinking aren't the ones you would be taking a winnebego...
On another note, RV parks, which you would probably be camping at in order to have access to a power outlet, have extremely varying quality of their 30 and 50amp outlets.
Not that there aren't strong arguments in favour of trailers as well (you note several).
QED there is a dude sleeping in that van for whom Stealthing is the case, and an observer outside the van for whom it is not the case; for all values of dude, van, and observer.