On our 2005 Fleetwood Excursion 39S instead of taking the same amount off of cabinet all the way around, on the front of the cabinet, I changed the front angle taking four inches off at the bottom and two inches at the top. Now people don't hit their head entering the MH.
When I cut the front off of the original cabinet, I did not remove it from the MH. After you remove the old TV you can get to the finishing cover of the cabinet from the inside. Take out all of the staples and peal it back towards the windshield. After having marked where you want to cut it, use a saber saw on it. When I got close to the ceiling, I slid a cookie sheet in between the top edge of the TV box and the ceiling. I cut the sides off the cookie sheet and sanded down any rough edges. Then I used a small handsaw to continue the cut to the ceiling. The cookie sheet protected the ceiling from the saw blade just fine.
We then went to Costco and got a new flat screen and built a new front to the cabinet. I went to local cabinet shop and had them build the new front. Then I built a frame around the flat screen and attached it to the new front. The front is hinged with a double hidden hinge running on the right side from the top to the bottom of the cabinet.
Now with all of the space left in the smaller cabinet behind the TV I put in a shelf where the wireless computer printer sits along with the wireless modem. We have a Velcro strap over it to keep it from bouncing. It's very nice to have a wireless color printer in the MH and it's even nicer that we don't have to get it out and hook it up every time we want to use it. We do have to open the front of the cabinet to make room for the printer output tray.
The combined weight of the new TV, printer, router and other printer supplies is a lot less than the original TV.
When the cabinet guy came over to help mount the TV I also had him install all new heavy duty ball bearing drawer slides in all of the cabinets. I've found that for jobs like this it's far better to go over and personally talk to some small cabinet shop. Explain what you want, that you're not in a big hurry and it can be done on a weekend for cash. Have the guy come over, take the measurements, look at what finish and style he has to match on the rest of the cabinets. They'll usually work on it in the evenings and then install it on a Sunday when they're off. I've always had good luck with this approach. The larger shops are harder to deal with.
Bill
Nodwell RN110 out moose hunting. 4-53 Detroit, Clark 5 spd, 40" wide tracks, 10:00x20 tires, 16,000# capacity, 22,000# weight. You know the mud is getting deep when it's coming in the doors.