Yeah, it's something I've been keeping an eye on. My father in law doesn't see how electric cars can work, one of his main objections is he tows a caravan. Admittedly UK caravans are pretty light, 1400kg is about the middle of the range. There are now a couple of pure electrics with enough towing capacity (Tesla X, Audi E-tron, Volvo something or other).

Unfortunately, there isn't much getting away from the fact that towing a big box behind a car halves the economy, and while those cars are starting to have very useable ranges, even if you need to occasionally travel longer distance, halving those ranges leaves you a bit short.