Our Northwood Fox Mountain came with a heavy Jensen 32" 120V tv. I just swapped it out for a 40" Samsung TV. The 40" is quite a bit lighter than the Jensen 32". I had to move the swivel bracket or 2" to center the tv. Northwood has really stout blocking for the tv, so you should be good there.
Also when looking for swivel mounts try and find one that locks into place for traveling. Also dbl check the bolt pattern on the tv for mounting. Our new Samsung has the 8" hole spacing which is the same as the Jensen that came with the 5th wheel. Some TV's have smaller spacing so you need to match up the bracket to the tv. I would look at a place like this for a swivel bracket. Not necessarily buy from them but get some ideas.
RV TV Mounts - RV Satellite TV Antennas | TVForMyRV