Gary,

You should be able to run all four CAs or roof airs on 50 amp shore power.

The biggest current draw for 15,000 BTU roof airs is about 15 amps. Starting load is much greater but that is temporary. You have to manage your power usage however. You must set the inverters to the lowest charge rate, or even turn them off until you can operate on less than 4 ACs. Obviously you cannot use any high consumption devices like a clothes dryer, or a microwave, or even a big coffee maker. We reserve the time to run the dryer or make coffee for in the morning when two or three ACs will keep the coach cool, and then after we are done drying the towels or having coffee we put the other AC units on.

What is especially important to consider are those things that cycle on and off without any input from you such as a HW tank. You don't think about it, but if it cycles on when two ACs are running it can trip a breaker at the shore power box.

Having said that, if you can keep your current draw to less than 40 amps per leg, lower if possible you should not be tripping shore power breakers. If they do trip it is likely a breaker that has outlived its usefullness or is something as simple as a loose connection.