I think if you get a mount that is easily removable or can take the tv off of it while traveling, it would reduce the stress on the screws and make for a lasting mod.
Just a thought...Is the vac plug polarized(one lug wider than the other)? If not, does it trip the GCFI in either orientation in the outlet? Assuming it's a two pronged plug.
To further confuse this. the flickering lights could have been caused by a loose connection at the fuse box and eventually burned itself off the connection.
