8Ball beat me seems we all want everyone to be safe.
I too have seen those screens at walmart glad we have a tester please let us know how it works.
I know you know this already so don't take it the wrong way "a circuit breaker protects what is behind it not what is in front"
example everything before the campground's electric post is protected by the breakers in the post.
the cable from the post to the camper and the components that make up the WACO is protected by the breakers in the WACO.
if you replace one of the WACO 15 amp breakers with a 20 amp breaker the components in the WACO may or may not stand up to
the increased amp draw and burn up before the breaker trips.
worst case is something may catch fire while your asleep or off catching some fish, and we don't want that to happen.
Pete