Hi. trebor, welcome to the forum. As you get to know more about the Forum, you will discover the topics about EV's can become hot potatoes, with often long held opinions coming to boil. Nothing wrong with a good debate. Just stick to facts.
As soon as you hitch any trailer to a car, you immediately hurt that cars efficiency, yes the milage per Gallon efficiency of even the most sought after towing vehicle drops. Ironically, it affects the most efficient vehicles the most. That is why EV tow ranges do seem sub par.
To put it into perspective, a litre of petrol or diesel each has closed to 10 kWh of chemical energy in each litre. When you consider that even today an a large EV may only have 100kWh battery capacity, and yet modern EV might have 350 mile range, that represents quite incredible running efficiency. Hold that thought. Now how far could your typical ICE car go with just the same amount of energy(10L) in the tank? You'd be lucky to get 45 miles, and do the same whilst towing, it would of course be much less.
That shows the efficiency of EVs, and is at this stage, why the still don't meet everyone's wishes.
But having said that, there are some members on this forum who already do caravan with EV.s. if you approach EV ownership with a no change needed perspective, you probably will be disappointed. Owning and using an EV does need a change of plan, so do look up the likes of Tobes, and others who have transitioned to which changes of approach have made it possible for them.
Beyond that, the future is changing, in particular mew battery technology is continually improving which will make it possible to recharge an increasing number of EV's from 10 to 80% in only 10 minutes, and as the infrastructure improves, it will become more realistic to caravan.
But also understand, it's likely the access to caravanning may also change overtime, it's a moving platform