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I had a plumber come in and fix my SS to where I could use shore water when it was available, vice having to keep filling up the storage tank. He did some work on the inside that provides me with a shut off valve to keep shore water from going into the tank and installed a line to that for the shore water (see picture one). Picture 2 shows the underside of the SS. The water line is the one in the front. It has a shut off on it to keep the water from the storage tank from running out if you are using the tank instead of shore water. I decided to install a drain line so I didn't have to crawl under the camper to hook a hose up to the sink drain. One thing to remember is on the drain, make sure you install a vent pipe so the water will drain properly.
On the front end, I had my spare tire mount welded onto the frame, added a storage box and the pole you see sticking up is for an antenna. All easy things to do once you figure out what you want to do.