Electronic sway control trailer option?

Interesting and pretty thorough sounding replies. I guess I always focused on trailer balance and good equipment for the job. I previously had a Nissan Pathfinder towing a Jayco 23b which was at the upper limits of weight for the Pathy and quite long for the TV's wheelbase. Rear airbags, a good WD sway control hitch and a good brake controller did the trick last time. Never exceeded 65mph and always felt comfortable with the tow.
The basics worked last time so I will view the electronic anti-sway as a possible further safety feature and focus first on the fundamentals. Proper balance, proper gear, proper towing habits.

Thanks for the input!