Waste disposal for stationary seasonal location

Yes, we are the owners of the acreage and also there are no other campers. With the ideas of all who were kind enough to help I think we will come up with something. Now, finding the right trailer is pretty confusing. Granted you can find the floorplans one likes but trying to figure out what brands are better is another matter. Love the Airstreams but would have to sell to many acres for that one.
Thanks again