HotelonWheels- Emergency Exit Window Qs

Where do people recommend getting an emergency exit window with the trim and hinge? I found a few on ebay and amazon but they didn't have a lot of details or big ones.
Has anyone added a gas strut to lift window or did something else to make it easy to open? My 5yr old can lift the littles (~20lbs) barely by grabbing under the arm pits but I doubt he could push up and hold out a window panel. He is definitely not coordinated enough to open and put in a stick to hold it open. The proposed location of window will have inside cabinet to climb on top of and fender on outside as step down. I just need to figure out how he could get window open if they are inside having nap time and we are across campsite when trailer lit up.
Has anyone added a gas strut to lift window or did something else to make it easy to open? My 5yr old can lift the littles (~20lbs) barely by grabbing under the arm pits but I doubt he could push up and hold out a window panel. He is definitely not coordinated enough to open and put in a stick to hold it open. The proposed location of window will have inside cabinet to climb on top of and fender on outside as step down. I just need to figure out how he could get window open if they are inside having nap time and we are across campsite when trailer lit up.