If it's at all recent, the fridge probably does not have a pilot light. Most in recent memory are direct spark ignition. At any rate the fridge burner should be isolated from the inside of the RV if the installation is proper, so you'd be more likely to smell the propane outside than inside.
I would check the stove and oven controls and burners for a propane odor inside. The range is usually the only gas appliance where the burner is "inside" the RV. The water heater, furnace, fridge, and generator (which probably isn't propane powered in your case) all take their combustion air and vent their combustion gasses outside. I'd also check the regulator as they tend to go bad after several years and develop small leaks in the internal diaphragm, which leads to gas escaping; the solution in that case is just to replace the regulator. Again, that should be outside the RV.
