Need recommendation for quality articulating LED TV mount

I just mounted a spare 32 Vizio in my guest bedroom. The Vizio weighs about 36 pounds. The bracket is rated up to 70 pounds.
I wouldn't use this bracket in my rv as it wouldn't be rated for any decent dip or bump in the road.
How much do you guys want to over engineer the weight rating to actual tv weight to accommodate any possible hard bumps.

A frost heave sneaked up on me in Alaska once that would have been a good test.