I am getting ready to modify my trailer so if needed I can haul my M3W.
I was not sure on the actual weight so I took it to a truck scale and had it weighted.
With the fuel gauge reading 50% and no one in the car here is what the truck scale read.

total weight 1300lbs
with just the front wheels resting on the scale 800lbs

I do have a much larger battery and lots of sound insulation installed.