I too added a safe t plus stabilizer to our 31ul, I did it for two reasons.
To add stability and safety should a front tire blow,
to help with overall handling.
I have read many times for handling the rear trac bar is the largest improvement, I personally have no experience with one.
I was not thrilled driving over 60 mph coming home. After increasing tire pressure and adding the safe t plus I now drive 65 without a thought. I sometimes catch myself keeping up with traffic at 70 and a couple, then I slow her back down. My ideal is 63 to 65.
I will also say that having a couple thousand mile experience has also helped a lot!