I mounted a TV on the wall beside the refer in my 1987 Excella. The wall is veneer over particleboard. What I did was buy some 1x4 red oak, cut it into two lengths to fit across that wall and stain the boards to match the oak cabinets in the AS. I then screwed these boards to the wall, basically into the framing behind the wall using brass screws with a brass washer under each screw. Then I attached the swing-out TV mount with the large screws supplied, right through the 1x4's and well into the wall. The TV, btw, is a 24" Samsung.
1987 Excella 32-foot
1999 Dodge Ram 2500HD Diesel