As in the 1950s, the standard mobile home of the 1970s would also have come fully-furnished. However, the quality of articles used had fallen drastically. Interiors were often done in rather gaudy "Mediterranean" decor.
Drawings from the Oxnard Press-Courier (Oxnard, California)
Appliance-wise, these would have been the colors available for the new mobile home of 1970; standard white, coppertone, avocado green and harvest gold. The pastel shades that had become popular in the 1950s had been phased out in the mid-1960s.
Quality issues, and dubious features (such as cheap -and potentially dangerous- aluminum electrical wiring) caused the US Congress to pass stricter standards for construction in 1974.
The National Mobile Home Construction and Safety Standards Act became law in June 1976. To get away from all of the negativity associated with house trailers or mobile homes in general, the product name was changed to "Manufactured Home", which was Federally mandated in 1980.