Frozen T@B

Other than finding a heated garage you might try plugging the trailer into shore power, fire up the Alde system and get the trailer heated up.  That, or running the trailer on propane to heat it up.  I don’t know what your elevation Is there but would guess that the freeze might not last, that day time temps may rise above freezing and this will allow you time to remove water from the trailer.  I’d also dump RV antifreeze into the p traps, get it into the black and gray tanks and you could open up the trailer water valves to relieve any pressure.  The PEX pipe is forgiving and unless this is a sustained winter freeze you should eventually be able to remedy the situation.  I left a hose out one night in the Davis Mountains, the water froze up, but eventually unthawed once the temperature warmed up above freezing.