Convert our Trailer's electrical system from 30 to 50 amp

But when we're vacationing (depending on where we are at), there's four TV's, four DirecTV DVR's, three iPad's, a PlayStation, three laptops, five phone chargers, two fans, outdoor beer fridge, party lights, etc.

Isolating the popping circuit breaker is a good place to start before spending money. BTW, cell phones and tablets use a VERY small amount of power, thus not contributing to your issue here. Everything else most definitely does.