Update to my Towing analysis paralysis resolved, I think!.

I noticed in your signature that you have MorRyde IS so no one can suggest that it should help the ride. I don't have IS and feel the ride is fine with my 15400 pounder with 8k axles, 17.5 wheels with MorRyde center point equalizer. So since you DO have IS, the hitch and pin box upgrade is about all you can do.

They are not causing it, nothing will cure worn out highways, but these are good items to look at doing.
The old concrete highways are the worst, due to the expansion joints that have separated, or sunk, causing your truck, and FW to move at different rates of speed when going over them.

Cummins12V98 wrote:
Air bags on truck set to 30psi loaded,Check Bilstien shocks Checkand PROPER tire pressure will do wonders.Check The RV has far less impact on the truck than the road does. Cure that problem FIRST before wasting your $$$.

I'm not sure how these 3 item's alone would cause the severe jerking fore and aft on poor concrete roads with bad expansion joints. Also when hitting sections of concrete that has dropped an inch or 2 the transfer of vertical energy between the truck and trailer is so severe it rattles the teeth and with the quality of the Lippert frames and the condition of roads not getting any better I am definitely becoming afraid to tow for fear of major frame failure.

I'm on my 5th season with our BD3 and have been thoroughly pleased with it. I also had some chucking issues but changed trucks and bought the BD3 at the same time. I'll never know if it was more the truck or the hitch but still glad I have the hitch.

You are doing the right thing.
The MorRyde will help with fore/aft movement.
I have a BD3 hitch and it really, really cushions the forces between an otherwise rigid truck/trailer connection.
The money your are spending is probably less than the possible repairs needed in the future to repair the pin box area due to the harsh impact if you continue to use your current set-up.
I'm amazed how many people don't even consider an air hitch for their truck when people on the forums ask for hitch recommendations. The difference is amazing in the noise and banging of the impact when on these harsh roads. Its great to look in the review mirror and see the pin box floating on the air hitch and not to have all the impact you are speaking of.
I have the BD3 with a GM/Ford puck adapter. When I bought the BD3 the 5 was not on the market yet and there was no puck adapter. Then they came out with one. I'd love to sell the combo and get the BD5 that requires no adapter. I'm right at the max on the BD3 so the 5 would be a nice upgrade.
Let us know the difference you experience when you get the upgrades installed and tested. You will love it! Safe travels.

Air bags on truck set to 30psi loaded, Bilstien shocks and PROPER tire pressure will do wonders. The RV has far less impact on the truck than the road does. Cure that problem FIRST before wasting your $$$.

“I have been stuck in a state of analysis paralysis over how to alleviate the jarring and chucking...”

You are overstating the issues IMO. Unstick! Enjoy. Move on.

It is too bad you couldn't make the TS3 fit. The BD3 will dissipate the bouncing forces and the MORyde will help with the chucking forces. The TS3 would have been a better solution for your ride. As a fifth wheel's pin pushes down, it also pushes forward; this is why you have both bouncing and chucking forces. When the trailer pushes a TS3 down, the hitch head also retracts due to the high hinge design, eliminating both forces. My trailer was a bouncing, chucking mess with a B&W solid hitch, intolerable. Towed it home from a trip today with the TS3, a pleasure.