2nd AC in bedroom or garage if using for sleeping?

I am thinking that running two AC's on a 30amp or three on a 50amp system is going to require some kind of electrical management control. ie if your running all your AC's amd then flick on the Microwave or Coffee maker it's going to shut down one of the AC's till the load passes. I look at RV's going down the road all the time and I don't think I have ever seen a TT or Fifth wheel with 3 AC's on it. Not saying it's not done but must be pretty rare...