We changed the bedroom seeking to a Roku. In the ACE 27.1 the bedroom tv is only 24". When we bought the new to us rig, we were told we had a 28" tv in the bedroom & never checked, so when we tried to switch it for a 28" Vizio we already had, we were quite surprised. We had to get a 12" Philips head screw driver to fit behind the tv to get to the mount and to remove the old tv, we had to cut the cord holders that attached the cord cover to the cubby ceiling behind the mount. Once everything we needed, the actually switch took almost no time at all. The new Insignia tv fits great, maybe even better because it is a little differently configured in the back, causing it to tilt more than the original The original mount was able to be reused and secures the tv to the front of the cubby. The 12" screwdriver is now stored in the RV so when/ if we switch out the main tv I the cabin we have the tool we need.
Side note: the Vizio tv was found to have a non removable cord that stuck straight out the back which would prevent it from mounting flat with the type of flat mounts supplied in the Thor as there is not enough room in between the mount and the wall to allow for a plug sticking out 1-1/2"
Now I know if/when shopping for new cabin tv, I will look for a bottom mounted cord the sticks down - not out!