Never buy new. They lose more value than a car the first few years.
There’s lots of money in well, sewer, roads and electric hookups. If you go mobile, be wise about their location so they can be used for the permanent house.
The only way I would do it is if I were building a permanent house on the same lot. But it would be cheaper to just rent a modest home close by and save until you have the cash to build. It would be like camping at a KOA. Not comfortable and kinda expensive.
