Here is the promised drawing on file from Sabre for the bedroom tv 5th wheel backer placement.
Its unclear the exact model year and what models they started installing the backer and it is Not VIN specific so be fore warned that you may or may not have it place in your unit.
Backer edges can be verified with a strong magnet as to wether its there for sure.
Currently SABRE is installing a 24" tv that weighs no more than 10.8 lbs.
I would defiantly not exceed what sabre is currently using.
I would also defiantly use a high quality mounting bracket and high quality screws to secure your unit.
Your results may vary so defiantly make sure you can mount the bracket SECURELY !~