Is your truck gas, or are you towing way more than 5000 lbs? My guess is it would get better than 50% of its range because while you're (practically) doubling

Is your truck gas, or are you towing way more than 5000 lbs? My guess is it would get better than 50% of its range because while you're (practically) doubling the weight, that doesn't matter because of the regenerative braking. Electric cars spend most of their energy fighting drag (as evidenced by people taking a model S almost 600 miles on one charge at 20 mph) and a 5000 lb trailer probably won't double the drag profile.