Are the silver ones the 5100s.That is what I have on the rear now.Don't remeber where I got them from but remeber when we installed them and cut retainer strap they raised the truck bed.Even with 3000 lbs fiver pin weight rear tires come off ground when hitting a bump towing.Empty I am sideways when hiting bump while shifting.From what I have read the 5100s are for liftted trucks.Would the yellow ones be a little smother.Was not that rough with stock shocks on.

 

Yes the silver are 5100s. The yellow are the Heacy Duty. I have had both and do not think either is "softer". The smallest 5100 for my truck accomodate a 0 tp 2" lift. On my 2500 it is stiff but I expect that from a heavy duty truck. I have yellows on my van and it rides like a caddy.
If your truck is coming off of the ground on the first bump it is the spring weight that is causing that. No shock can over come a stiff spring. The shocks job is to dampen the movement, slow it. If the truck is bouncing twice or more the shocks are bad. I have had a bad Bilstien from the factory once. I still put them on everything I own, install them once and never think about them again.
If you want a more comlpiant suspension, remove a leaf or two and add air bags.
Good luck