after you get the hitch set up correctly, have the best shocks you can get for towing (I like the Bilsteins on my GM's) have LT tires on the TV, inflated correctly, etc. there is one other improvement that I've found makes a very very big ride improvment. But, like most things in life, you get to choose, good or cheap, and it ain't cheap.
That is an Air Safe Air hitch. Basically it uncouples the trailer movement from the TV, so frost heaves, expansion joints etc. don't have near the effect on the TV. I can go over a frost heave and see the trailer front moving up and down and not feel anything in the TV. Before you'd feel the trailer push the TV rear up and down. But unless you do a lot of traveling, the cost probably isn't worth it.
I have the Class VII 2.5" shank unit, and it is around $1500!! But for us it is worth every penny since we travel 10K miles/year all over the place. I'm using it with our 3/4 ton duramax both 04.5 I had and now the 2015.5. Our trailer is big, 10K lbs or so loaded, 35' long with pushing 1500lbs on the tongue.
And it does work with virtually any WD hitch.
IMHO it is an excellent solution and product, but isn't for everyone given the price. And it isn't light either, around 100lbs.
