First off, are you using any kind of extension cord or adapter between your trailer, and the pedestal? If so, make sure its a 30AMP cord, and not something smaller. Next you don't say which breaker pops. The pedestal, or in your trailer?
If you are using your 30amp cord, with no adapters, plugging into a 30amp receptacle, then you are on the correct path with the dealer. If you are using anything less than 30amp components, like cords, plug adapters, etc, you are going to run into problems. You should be able to use all electric components of your trailer on 30amps without having to jump through hoops.
