I am going to pick selected items to respond to.
Most motor homes come with Generators. Most Trailers do not but some buy them as a luggable item.. I do agree haveing a genny is handy.
Both a pro and a con and I'll say more later.Some of the furniture (Bed usually) Is part of the RV. much is standard "Home Goods" store stuff. Some slightly modified for RV use.
Very small learning curve.. INSIDE, is basically a house. you care for it just like you do your Sticks and Bricks Mop, Vaccum, Dust, Wash, Wax same as you do now. zero learning save to LOCK (physically lock) and secure before moving.
Outside.. The Roof is a lot like a kitchen floor. MOP do not wax
The sides are like a car, Wash and wax
Special Stuff.. You need make a mistake only one time and you will know far more about sewer systems than you EVER want to know.. Trust me on that

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Yes. or no depending on where you park but usually yesMine is a bath and a half and bedroom and a half (The living room converts)Optional
Some RV's do come with a tub. But most with a telephone booth shower (or smaller) most have 6-10 gallon water heaters but there are other options. Those have disadvantages as well. I use park showers. Nice, Long, Hot Showers.
NOTE. IN August, In GA. I had unlimited hot water for my shower... and I'd accidently turned the water heater OFF.