First what about the stove is the issue? will none of the burners work, or are you simply having oven problems? If the burners do not light, do you hear gas escaping from them? (Oh, and those stoves do not have pilot lights - you must use the electric the spark knob on the front [or use a match] to get the burners to light!)
The hot water heater and the furnace also work off of LP gas. Are these items functioning?
If your problem is that no LP gas items work, you may be out of LP gas, OR the valves on the LP are turned off, OR the regulator is malfunctioning. (another answer may be that the LP detector has shut off the gas - this is a safety measure if a leak is detected. It may also be that the detector has malfunctioned.
As for the fridge, most have a switch that allows you to select between gas, or electric (120 volts) or automatic does yours work in any mode?
Geoff & Judi's suggestion about skirting the trailer is a good idea. Hay bales seem like a good and relatively inexpensive solution.