There was almost no commercial traffic and far less other traffic on the new Interstates in the 1960's. I saw almost the entire lower 48 before I was 18 from a car. There were days where one might drive an hour or more when west of the Big River and not see any other traffic (mid-day, mid-week).
As to worrying over suspension, tires, etc, the video shows what any trailer goes through to greater or lesser degree. A rough road -- even at a slow speed -- shows some of the compromises with which these are built. There are those who take them off-road, but not with some of the frou-frou the rest of us consider normal hanging from walls, closets, etc.
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