I own a mobile home from the 60s and these are a few things to consider. It may look OK on the inside but,these trailers were not built very good back then. [1.] 2x4 walls. [2.] Insulation will be non-existent. [3.] Under the trailer has had almost 40 yrs of moisture.[4.] Joist are on 24" centers, don't know if you can nail hardwood on that space.[5.] Trailer is not worth the money you want to put into it,or the extra money you have to pay in energy cost. I could go on. Ron J.