Sting, there has GOT to be somebody that would be interested in that stoker/boiler setup if it's still worth setting up and running. Not sure how you'd move it, though.... To buy something new that is equivalent would run $50,000 minimum. Even the little S-30 Will-Burt and Burnham 4N-63 boiler would run $15,000.
It would be perfect for a farm (or modern greenhouse) down nearer to coal-country in Illinois here or Indiana, even Kentucky. Only "problem" is size, age, maintenance and hauling clinkers for 1,000,000 BTU/hr worth of bituminous.
But, calculate the savings of $80/ton coal per MBTU vs. propane per MBTU and hauling clinkers starts to look pretty appealing!