The top bracket doesn't do much. The long angled bolts that go in from the bottom and the lip that it hangs on are the main supports. I used a small floor jack to lift it off the wall bracket. The problem is its VERY heavy and you cannot get yourself under it to lift it up. The microwave in my home came out easy I just moved out the stove and got under the microwave you cannot do this in the motorhome. When you put it back you must line up the long bolts perfectly with the bracket you cannot see the back of the oven when you reinstall it I tried several times before the bolts grabbed.
07 Itasca Ellipse 40fd, 2014 Honda CRV, greyhound lab mix, pit pointer mix(RIP bessie) , shar pei mix, stupid cat, wife