When you hookup to the 30AMP Pedestal Connection using the 30A to 50AMP Adapter both HOT 50AMP legs to your Class A is powered up to the 30AMP MAX point. This means all of your on-board appliances are ready to be used but will be limited to only 30AMPs. You will really have to watch what you have on at the same time otherwise it may trip the 30AMP Pedestal Breaker.
This is a DMBRUSS drawing of how the 30AMP to 50AMP adapter is wired up. Note the two HOT sides are wired together feeding your 50AMP CLASS A..
Of course you will be required to provide this adapter to be able to use the 30AMP Pedestal... I saw them at our local WALMART recently
Be sure to look at the adapter as there is a 50A-30A adapter as well as 30A-50A. You will need the one with the MALE standard 30A PLUG on one end and the 50A FEMALE connection on the other end like the above GOOGLE diagram shows.
The Camp Ground Pedestal will also most likely have the 20AMP service connections as well. I always bring along a couple of HD extension cords and use those as well at the camp grounds. These are all on separate pedestal circuit breakers so it what you are using on the 20AMP side is not taking away any power from the 30AMP side...
Typical 30A PEDESTAL setup
Roy Ken
