Towing is more than one thing, what were these americans towing? Their caravan/mobile homes are typically MUCH bigger than ours.
What roads, hilly?
How hot? usually the UK doesn’t get anywhere near US temps either.
Looking around again depending on towing full caravan, camper, trailer etc you’re generally looking at around 2 miles/kwh at 65mph according to those who do it. Don’t forget n line has 83kwh battery so say a towing range of 160 miles?