Just a different perspective: We bought a 1976 double wide a few years ago. Planned to save lots of money with it. Didn't turn out that way. Some was our stupidity, some was bad luck, changing desires, etc. We bought a property, confirmed with the zoning office in person, with the address prior to buying that we could put a mobile on it, had the pad and driveway put in, bought the mobile in cash ($12,000) went to get the moving permit, were denied by the city. Turns out our whole subdivision allowed mobiles, except our street, which did not have a "zone"' so it reverted back to R1, which allowed mobiles if they were 1983 or newer. Then we decided it was easier to sell the property than the mobile, so we bought a new property in an area we liked better, on and on. Did I mention it was 2007 - 2008... Huge money wasting adventure. Was an immense remodel, we over-improved and will never get our money back. It's paid off, and if it wasn't a 30 mile commute each way I would happily live in it now. Because we did a complete gut, and it is lovely.
So I know many of our issues (placing utilities cost a fortune) won't affect you, but if you do this know you can waste a lot of money improving this house and never get it back. And where I live, mobile home "parts" are more expensive than the equivalent in a stix and brix. And no one you hire may know what to do in a mobile home. Just remember, this is a depreciating asset. Figure out what the vacant lot would sell for, and don't pay much more than that.