The Bay Area in California has those expansion joints also. I would say there is nothing you can do about it except maybe add some weight but who wants to do that. I doubt if CA will change the way they the make roads so you will have to live with it or buy a car.

 

There are several posts here that describe the so called problem in different senarios. Some have the problem when driving over bumps or expansion joints or whatever, others describe the problem on perfectly paved roads at certain speeds. First, bounce and vibration are two totally different occurences. Do they both happen? maybe, possibly. As previously mentioned these are heavy trucks and will bounce and shimmy over bumps period. Can this be minimized? absolutely. Will you eliminate it? probably Not. If the truck "vibrates" at certain speeds it has a problem or problems and you need to find and correct the problem.

When i bought my factory new truck it would bounce and shimmy over bumps and uneven pavement and expansion joints. It bounced on normal or well paved roads at certain speeds but barely enough to really notice or become bothersome. Once i lifted, installed bilsteins and added 285/75 Nitto's at 60 psi it still didn't do it enough to be an issue. I raised the tire pressure to 70 and it sucked, big time.

In all the different variations of trucks out there and however your truck is set up, the biggest thing you can do is again: ADD WEIGHT TO THE BED. The further to the rear the better. Bilsteins or similar may not help and if your not used to, or like a stiff riding truck don't buy them. If your shocks are old and worn, yes replacing them will help. If you have the time and money you can try picking tires and adjusting tire pressure's until your satisfied. Every truck is different, LB,SB, SC,CB, diesel, gas, options, GVW, spring rates, tires etc.. the list can be endless and all can play a part on the trucks ride quality.

Your only other choice is to sell the truck and buy a luxury car.