Welcome to the forums.
Somewhere around the time your trailer was built, the furnace ignition became automatic. To make it work, you should have to just turn it on. If it is one of the earlier ones, you have to crawl on your hands and knees, and push or pull the gas valve while continually pushing the ignition switch until it lights.
For the fridge, turn the fuel selector to gas, pull the gas valve, and continually push the ignitor switch until it lights.
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.