Its a well known fact that its not safe to be at the maximum tow rating. 80% or less load is a good rule of thumb.
I think you should tow 80% of 80% of the maximum tow rating. Wait a minute. That dosnt make sense. If Mazda set the maximum tow rating at 2000 lb. I think they probably did some research, ran some tests, looked at the structure of the car Etc before coming up with the number. In short, I think maximum tow rating equals maximum tow rating.
BTW. Nothing effects safe towing as much as the percentage of weight on the toung. Make it to light and you have a very unstable trailer.
BTW