If you can find a direct replacement, it is a fairly simple swap.
I replaced my rears recently but bought a different type which required welding the included bracket to the old bracket so that it could install correctly. The PO had put a new style on one side, but it was not installed level and I wanted to make it all right.
The other issue I had was that I did not use the correct sealing compound on the pipe threads and had to take them out again and redo the pipe threads to fix a couple of leaks. All is good now.
You also need to determine the correct ride height to set it so that the ride height is correct to avoid bottoming and driveline alignment issues. See my thread for some more details as the information on the correct ride height setting for my 1994 Signature was not readily obvious.
On mine it was a somewhat messy job and you need to be very careful anytime you get under your coach. If you are not comfortable with getting dirty and securing your coach safely, please use a truck service (rather than a motor home service).