I did not it was apart of my delivery tasks but it tells me that I have to wait for a delivery date before I can purchase. Apologies for the delayed response.
For my VIN yesterday and I got a quote from Tesla Insurance at $243.22/month....that is high to me seeing how I already insure 2 Tesla's with them for $247/month
I'd imagine that if you are getting the range extender then you are towing and possibly that weight can be allocated to whatever you may be towing i.e. travel trailer or toy hauler. So hopefully it can provide at the min 100 miles of usable range.