What are you talking about. EVs can afford to have absolutely massive AC and heat for that matter because that big battery is multipurpose. Well big battery in good EVs at least, not in this prototype, but I’m sure they’ll up it if they do a real product.
And also, as you say, they will usually be on power (also because they’ll want to charge up for their next leg, which solar will not be sufficient for) so I’m twice over not seeing a reason for concern here.
I just own a camper van. In current state of affairs, heat is a solved problem with diesel. Air conditioning still does not have a viable solution, aside from shore power. You can't practically use electric for heating or anything really beyond powering the lights and the heater fan.
Most vans max out around 3kWth. I have seen people use a used Tesla battery, but only have seen one report.
I guess we are talking past each other. You seem to be expressing perfectly valid conclusions based on the current state of RVs, and I am thinking about what will be possible in the future when instead of a gas or diesel tank, some RVs will have a massive, massive, battery as current EVs do.
And also, as you say, they will usually be on power (also because they’ll want to charge up for their next leg, which solar will not be sufficient for) so I’m twice over not seeing a reason for concern here.