There would effectively be no difference on a paved road. You'd need at least a bumpy dirt road to begin to tell.I was looking into trading for an HD and drove the AT4X HD and the AT4 HD back to back to compare the ride with and without the DSSVs and frankly I could not tell the difference. This was down both smooth and expansion joint rough roads. Maybe they are better off-road?
I have an AT4HD and live on a bumpy dirt road. I've never driven the AT4x, but my AT4HD with stock shocks feels nearly as smooth as my 2022 stock tundra limited.