It’s a known fact that electric cars aren’t great at towing big loads. It’s not that they can’t pull them–they can, thanks to the immense torque that’s instantly available–but the driving range takes a huge drop when the weight increases. This makes towing a chore more than anything else because you need to stop more frequently to top up the batteries.
Things get even worse when sharp inclines or descents are thrown into the mix because the electric motors and battery pack have to work harder when going uphill, and the regenerative braking has a tendency to leave the conversation when going downhill while towing a large load.