The first question I have is what brand shocks are on it now. If they are Bilsteins or Koni then the answer is they are probably good to 100,000 miles. If they are Monroes then most likely they need replacing now. Get a flashlight and look at the shocks both the top dust cover and the bottom cylinder. If they are yellow both top and bottom then they are most likely Monroes, If they are yellow on the bottom cylinder and blue on the top dust cover then they are Bilsteins. If they are gold or red then most likely they are Koni. Most likely you have four shocks up front, two on either side and four in the back, two on either side also. If you have a tag axle then you will have two more shocks. Take a flashlight and check the bottom cylinder of each shock and see if any are saturated with oil. If they are saturated then at least that one and the one in the same position on the other side needs to be changed. You change them in pairs, one on one side and one on the other to keep it balanced. It is allowable to have a small amount of oil on the shock cylinder because they use wet seals on the rod and they have to leak a little to keep the seal from drying out.
"Gunner" USN Retired, Airdale
2004 Monaco Signature 44' Conquest. Detroit 60