EV's can make sense for a 2nd family car used primarily for commuting or for local delivery trucks. In both cases, they rarely exceed 100-200miles in a day (mostly far below that) and they can plug in and charge overnight using normal household voltage (demand is typically low at night anyway so the system can absorb a lot of EV's without a problem).
Where they have difficulty is long range travel...which is pretty much standard for RVs...It forces massive battery banks (with no sign of new battery technology on the horizon), which drives up the price of the cars making them economically nonviable. RVs are even worse as you combine low MPG aerodynamics with low miles per year, meaning even larger battery banks and fewer miles to recover based on fuel savings.
Then you have campgrounds with electric systems that already struggle and brown out during peak times, add in high amperage charging and they won't hold up.