I don't recall ever seeing a plastic TV mount. Is it an articulating mount or solid mount? Have you considered calling the manufacturer and asking the question. If they can't tell you I don't know who could. Until I got it verified, I believe I'd take it off the mount and store the TV on the bed during travel until I had a solid answer!
Days camping (2016)----181 days
Days camping (2017) --- 52 days
2016 Wildcat MAXX 28RKX (33' TT), 2007 13' Scamp
2015 Ram Laramie Hemi, w/air suspension
30 years RV'ing
12 different RV's