I am in the same boat Andy, I would love a full EV, but like you I tow a 1500 kg caravan, at this moment in time we have compromised and tow with a Mitsubishi Outland PHEV.
I too would love an ev, but this time round have gone for a diesel Tiguan Allspace (if it ever turns up) hopefully in 3-5 years there’ll be more choice.
I have just googled for an ev that can tow a caravan, and there only one suitable, the Tesla model x suv, and as I don’t see motability letting that on any time soon, unless they raise the cap to £82000 looks like I’ll have to wait a while longer.