We are planning our first real camping trip to WDW for Oct. We usually stay in the cabins which are great. This time we are bringing our pop up. I'm not sure if there is room on the sites to set up a screen house or if we will be better of with the add a room. We have 4 sm boys and will love any extra space. Also, does anyone know how sturdy the add a rooms are? What do you all think would be better? Thanks for the help.