We got a very small, teardrop trailer as a gift from a relative a couple of years ago. It's awesome, but I was absolutely floored at how badly towing it killed our mileage in a Y. We went short distances so I wasn't too scientific about it, but I'd wager it cut our range in at _least_ half.
Our friend borrowed it to take a small Uhaul trailer to pick something up from family and had a similar experience. At one point he called us asking, cryptically, "how low was safe to plan to get to a charging station." Turns out he was on a longer stretch between chargers that he'd handled fine on the way out, but, like the author, ended up having to leave the Uhaul and come back for it on the way back.
Our friend borrowed it to take a small Uhaul trailer to pick something up from family and had a similar experience. At one point he called us asking, cryptically, "how low was safe to plan to get to a charging station." Turns out he was on a longer stretch between chargers that he'd handled fine on the way out, but, like the author, ended up having to leave the Uhaul and come back for it on the way back.