Dumb question re. hair dryer

You know, I had 30 amp service in my last trailer and had lots of problems with the breakers. I was going to install a male type receptacle coming into the trailer and plug the 20 amp service to it so I could run other stuff, like another heater in the bedroom during the cold periods (rare but we do get some). But, know what? When running satellite into the front bedroom which didn't have a satellite receptacle I found out how ridiculously easy it is just to run a cord in through the slide out seals. That's something you could easily do with an extension cord, pull the slide out in just a little, slide a cord through, put the slide back out and no more worries about blowing the breakers. Sure, you have an extension cord to snake around but......