Class A motorhomes can be the most expensive RVs available, available with every conceivable luxury and amenity. They may look like buses but most are not built on bus chassis.
PRO
luxurious
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accommodations for several people
many come with slide-outs for increased living space
plenty of roof space for solar
CON
expensive
long, may exceed some RV park or National Park length limitations
material and assembly quality can be iffy, even on well-known marques (Tiffin, Fleetwood)
diesel repair and tire replacement can be expensive