I have had 1 besco switches on my race trailers threw the years. I have never had any needing replaced, They are plastic. That being said, my current Airstream has a different plastic switch that looks chincy. Not a Besco switch.
While airstreams breakaway systems use the 12 volt
on board system, (deep cycle Battery) my race trailers simply have a motorcycle batteries in the front tongue area to achieve the same thing.
In your case, it is probably better to have something hooked up.