Originally Posted by f1100turbo
What he said
Jeep, I need to add that you will have to learn how to manage power, especially with a 30 amp trailer. You are correct, that you cannot run lot's of things at the same time with out exceeding your breaker(s) capacity.
Besides your air-conditioner, things that make heat are your biggest energy consumers. Electric heaters, hot water heaters, toasters, coffee pots, hair dryers, microwaves, etc. are good examples.
A lot of people will run an extension cord from the camp pedestals 120 (20 amp) outlet into their trailer, to run some things off of (like your coffee maker), which will take some of the load off of your trailers 30 amp.