The camper would also be close by the well and power pole, I would have to dig a trench to run those services down to the other spot. I hadn't thought about taxes so that also makes a camper attractive.
If you have power and water the camper just got a lot cheaper. A lot of campers have generators, which you don't need. Ones with no generator, or a broken generator are much less expensive.
DW and I lived in a parked motorhome on our property for about 18 months before and during the build of our house. At first we lived off the generator, trucked in water in a 65 gallon poly tank in the bed of my pickup, trucked out sewage in a second tank, and only stayed weekends.
When we got the well in, we bought an external generator to power the pump, and I learned how to pump the sewage away with a macerator and 100' of 3/4" hose. Went into a small gravel pit and disappeared with no odor or flies. No exactly legal, but when I think of what the bears, deer and other critters do, no harm. We stayed 4 or 5 days at a time.
When we got power, I retired and moved into the parked motorhome permanently, while DW kept working (she is younger and her sentence isn't up yet). She came up 5 or 6 days every 2 weeks.
Then we got the septic in, and I deliberately put the tank in a place where there was gravity flow from both the house and the camper. I could have lived in the camper forever, but DW wanted a house.