All four of those questions are easily answered by tiny homes are basically mini mobile homes on wheels just as a mobile home is and hooked up just the same way to utilities.
I have lived in several mobile homes,bought two new..The difference between a tiny home and a travel trailer/fifth wheel is huge.
As an example,Nashua homes out of Boise Idaho builds tiny houses for Teton homes that state:
Designed for colder climates and heavy snow loads, the homes have R-40, R21 and R33 insulation, high efficiency furnaces and Low E dual pane windows. Other amenities include Whirlpool Energy Star appliances, fiber cement siding, Corten corrugated steel roofing, rough cedar siding accents, hardwood cabinets, sleeping lofts and barn style bath and bedroom doors that slide along runners.
Tiny homes are popular around here with lot rent running $200 a month in a mobile home/RV park.Or you could set in at a park on the Clearwater river with river frontage for about the same price or you could buy your own lot in a community on the main Clearwater river.
There not for everyone but they are better suited for full time living than an RV of any sort.