it all depends on how you usually use your trailer.....
yeah, a replacement 3 way fridge costs the moon...
my problem was the "power board" (cooling unit fine, no propane leaks
either)....I was able to find an RV guy who had a bunch of used boards salvaged from scrapped fridges....he had one that fit/worked....cost me 150 bucks with the fridge front panel (turned out to be a 2 way...3 way are hard to find apparently....and my alternator could not keep up with the fridge anyway so I never used the DC mode)
You could try to find a used one, the same size as yours (cabinet opening)
You could get one of those smallish coolers, runs on 12V or 110AC
Or you could build yourself a real good ice box....(that's what I'd do I think) a block of ice will last 5-6 days in a well built ice box....How long do you usually stay out?.....dunno where you live but around here blocks of ice are available at every corner store/gas station.....pretty handy....find the right container and you could make your own ice at home