Don't know without seeing what you have but can tell you that my tv cabinet had an access panel on the bottom that had to come off (4 screws) in order to get the tv brackets unscrewed and get the old monster removed. My rig has welded aluminum frame with a tray bolted to it that the tv sat on. I did not need to but if I had wanted to I could have taken off the wood facia, made some extensions to lower the shelf, then made a new facia. Basically, get some stuff removed so you can see how the area is constructed, then go from there. As long as you don't hack out anything structural without making appropriate compensation you'll be fine.
2002 Four Winds Infinity 37', 2 slides, F53 with V10, 22,500# chassis, CHF. 4 of us and a German sheperd.