I realize this is an ancient posting, however here are some thoughts that I gained from experience.
I ditched my very heavy Sony TV and installed a larger flat screen VIZIO HD in its place. I can tether my Sprint HTC to the TV and get expanded TV reception through my phone, anywhere/anytime there is phone reception. Here's the scoop.
1. Remove the 50 + pound Sony.
2. Finished the cabinet interior with Prego type flooring material or paneling.
3. Cut a piece of 5/8" plywood and wrapped it in vinyl that matches the trailer walls. You could also use this to finish the cabinet interior. Size the plywood leaving an extra 3 inches all the way around the TV.
4. Staple the vinyl to a 1/4" plywood and mount it with cabinet washers on the back of the plywood to make a really neat job. Get three cabinet hinges to match the other factory cabinets. (Home Depot or from the AS factory.) Mount the hinges to the top of the plywood and hang it on the TV cabinet frame.
5. Mount the 7 +- pound flat screen TV on the plywood by inserting screws through the plywood into the provided holes on the back of the TV.
6. Counter balance the TV's weight with hydrolic lift arms similar to the overhead cabinets or tail gate lifts. (Available on EBay) You will need two lift arms that are long enough for a full 45 degree swing upwards against the trailer ceiling.
7, Put an oak boarder around the TV using standard planking from Lowes or Home Depot. Counter sink the screw heads and use wood plugs to cover. Finish with stain and polyurthene (etc.) to match your interior.
8. Upon completion, you will have gained a huge amount of easily accessable storage space for cereal or other goods and if you have a 34' slide out you know just how much this extra storage is welcomed.
On the subject of microwaves, a convection microwave combination is definately worth the investment. If you're not into making big dinners, forget about replacing the drawer base under the stove top with an oven.