The purpose of this post is to spur discussion and not intended to be a whining or Tesla bashing post.
The currently shipping Model 3 I plan to purchase will run around 51K but to get towing capability might increase that cost by up to an additional 7K and I would probably miss out on some/all of the federal tax credit. Estimated guess on cost might be all wheel drive 5K + air suspension 1K + trailer towing hitch 1K. I would like to know the reason(s) why the rear wheel drive model may not be able to handle a towing option. Does the shipping rear drive model not have enough power or cooling capacity to pull a trailer? Is there a problem with the regen system if a trailer were towed? Suspension problem? No place to attach the trailer hitch? Any other reason?
I installed a Curt Manufacturing class 2 tow hitch on our 2011 compact class Voltswagon TDI Diesel and it works great. This car has 236ft-pounds of torque and 149 horse power. The curb weight is around 3300 lbs. This car can pull/stop a 1000 lb payload using my 500 lb trailer with no problem. After pulling the trailer for a few years, I did purchase a aftermarket progressive coil that is designed to install inside of the existing OEM rear coil springs (Something like this might also work on a rear drive Model 3 if an aftermarket vendor produced such a product). This progressive spring improved the handling, stopped the inside rear tire wear problem and keeps the car level while towing. VW does not void the warranty if a trailer is towed as long the car has a manual transmission.
Tesla states in the currently shipping Model 3 owners manual something to the effect that towing a trailer would effect handling, is not supported and (may) void the warranty.
Agreed, pulling a trailer with any vehicle would change the handling and be somewhat less safe than not pulling a trailer. Lawyers weigh in what does (MAY) void the warranty mean?
Bottom line it would be nice (if possible) to get a trailer towing capability on the rear drive Model 3. Having all wheel drive might be nice to have but is beyond my budget and will not pass the wife acceptance factor.