Yes you can legally camp on your own land whether in a camper trailer, tent, motorhome etc.
If you own the land outright or are renting the land and it's out in a rural area you can camp at that land for as long as you want too and whenever you want too.
If you have land in town or in a city then you may not be able to legally camp on the land at all or for too long.
Some towns and cities have ordinances that may prohibit the camping on land or parking motorhomes, travel trailers, tents etc on your land.
So if the land you own is in town or in a city then make sure you check with the town or city for local ordinances that may prohibit you from camping on your land.
If you have rural or wooded land then you can legally camp on the land if you want too without any problems.