Where in Michigan are you? Any RV place is able to check. A nose... a little soapy water and brush and you can check yourself. Make sure any pilots, flames, or cigarettes are out, put some LP in, and see if you smell anything. Brush the joints/connections with the soapy water and look for bubbles. Smell or Bubbles will indicate a leak. Turn off the gas at the tank, and repair, then retest until there are no bubbles... If the gas is on for any length of time and you don't smell the rotten eggs, it's a good sign the system is sealed up. There should be individual shutoff valves just before each appliance, as well as one on the tank itself.
