Trailer novice here, can you help me plug in my TT?

The cord that Roy has pictured is the cord you would need at a campground where you would normally plug into a 30amp receptacle. You need 30 amps to run everything in your trailer, especially the air conditioner. When at home, most people do not have a 30 amp receptacle so they use the adapter to plug into a 15 amp circuit. Keep in mind when plugged into the 15 amp you have to minimize what you run or you will throw the breaker.