I recall seeing that film (The Long, Long Trailer) quite randomly one night on TCM. I enjoyed it, even though I never really enjoyed I Love Lucy. I don’t recall that it was a color film, though. I guess that the movie trailer you posted is colorized.
Ok... I was close. Now if I could just remember where I put my car keys. ;>)
We own the movie. We bought it at Camping World shortly after we bought our Airstream trailer. While there are no Airstreams in the movie, it seemed to be a thing for Airstream owners to buy. ;>) I am very much in to nostalgia, so I surround myself with things from that wonderful time.