You want to focus on energy consumption per mile. In a "clean" condition, my MYLR uses about 270 kWh/mile (averaging 75 mph). With 72,500kWh useable battery, that works out to a range of about 265 miles. (My bladder can't last that long, so it hasn't been a problem).
I had occasion in June to pull a 6x12 U-Haul trailer over 300 miles. To extend range, I held my speed at 55 mph to save energy, but consumption still jumped to about 430 kWh/mile. That dropped my range to about 170 miles. After I was on the Interstate for about 15 minutes, the car's energy consumption display seemed to adjust, and estimated remaining range fairly well. I suspect driving at 75mph would result in terrible mileage, so be aware.
That said, the trailer was not at maximum weight, although it was a "solid" trailer, meaning air resistance was rather high.