Replacing the shocks on a large RV can be a daunting task when you look at the size of those replacement shocks. The RV shocks are much larger than a regular auto and require more effort to compress (gas shocks). The good news is that access to the shocks, in most cases, is easier on the RV than it is on the auto, however it is still difficult to see the wear points for the shocks which is usually at the bottom side of the shock bushing at the top of the shock and the top side of the bushing at the bottom of the shock. Those old shocks may still have some life in them, but the bushings at the top and bottom of the shock may be beaten to death. If you hear rattles coming from under the RV, you may be in need of new shocks.
Removing the old shocks and installing the new shocks will require some good leverage to push the shock up off the mounting bolt so that it can be removed and reinstalled. I found that by using a little muscle power, pushing up on the shock, after removing the bottom bolt, I could swing the shock away from the shock mount bracket. Removing the top of the shock was easy. Installing the shock at the top, first, then tightening the bolt holds the shock in place so that you can push up on the shock to compress it enough to push it into the lower mounting bracket. Using a bottle jack, with appropriate spacers under it, will make lifting the shock enough to get the lower bolt in place a lot easier.
I chose to do the front four one day and the back four another. A big job but the new ride is really worth the effort. Besides, the money I saved doing it myself paid for dinner for the wife.