You hose connecting the slideout to the propane pipe might be kinked. Otherwise, turn off and disconnect the propane supply, unscrew the supply hose from the pipe to the appliances, disconnect the propane supply pipes to the refrigerator and water heater, blow out the supply pipe with compressed air from the propane supply end. Re-connect everything, turn on propane pressure, test all fittings with bubble soap leak detector, then try things out. Be sure to give the systems a minute or so to vent out the air from the gas lines before seriously trying to get things lit.
Be safe and good luck.