Because people don't like the look of a mobile home being parked on the property next door to them. Anywhere you choose to live, you need to check zoning laws. Though, in many rural locations, that's not such an issue. There are a lot of areas around here with no zoning laws at all, because properties are far enough apart that people have the attitude if it's your property, you do with it as you want. Nobody is worried if the grass is mowed or there's a junker car parked somewhere on the property. The closer houses get to one another, the more laws start being created to keep the peace between neighbors. And, sometimes, even when there are zoning laws, one can get a "variance" from the town that allows you to break a specific law with their permission. An example would be if there's a law against mobile homes on the property, but you just want to put one on for a year or two while constructing a more permanent home, and then you'll remove the temporary housing. That can depend somewhat on the generosity of neighbors too. Again, as an example, the law might have been put there if someone was letting every brother, uncle and cousin plunk mobile homes on their property, making the place look like a trailer park and an eyesore to neighbors. But, if you want to put the home out in the middle of the property where none of the neighbors will ever see it, they might give you permission to do so with restrictions on where on the property it can go so you don't have it plunked out at the road edge where it looks bad to the people buying the expensive house down the road a ways.Why would there be zoning laws against it?
Really, with all these questions, we can't give you really good answers here. These are all things that vary from state to state, town to town, and even neighborhood to neighborhood. The only way to get good answers is to plan to spend some time at the local municipal building or with a local real estate attorney.
You'd want to get a good survey of the land to make sure there's water in an accessible location for a well and that the source isn't contaminated.Another thing I would need would be a well (in addition to septic tank and electric hook up).