For some people, a mobile home is good housing option when the mobile home is new, but when it gets old and no one wants to live in it any more, mobile home disposal can be a real challenge. Too big to just throw away and usually not worth rehabbing, it may sit abandoned until someone comes along and buys the lot it sits on. The new owner may have to try several approaches to make it go away.
Call metal scrapyards to find out if you can sell it for scrap, or even give it away for scrap. Mobile homes contain a good deal of steel and perhaps some aluminium and copper, and the frame and axles are made of steel. It may well be worth giving it away in exchange for having it hauled away.
Call car-crushing businesses, some of which are also scrap metal yards. One of them may take it for a fee. If not, ask if they know who might take it.
Dismantle it yourself or hire someone to do so; you will need to rent a contractor's waste bin to do this. As you dismantle it, pile the pieces in the bin until it's full, then call the company that owns the bin to haul it and its contents away. You will need to pay to rent the bin, and you will also need to pay a tipping fee for them to dump the debris at the landfill. Afterward, you will still need to get rid of the frame.
Call the fire brigade and ask them if they would like to use it as a practice building that they can deliberately burn down. This will only work if the mobile home is on an isolated lot, and some fire brigades won't do it all. In any case, you will still need to get rid of any remaining metal and the frame.
Call a heavy equipment operator who can crush it to rubble with a front-end loader, then load it in a dump truck or contractor bin. Again, you will have to pay the tipping fee, as well as the heavy equipment operator.
Run a classified ad offering it as one of two things: a free hunting camp, if it is at all habitable for short periods. Or a storgage shed. The taker will be responsible for hauling it away.
Sell or give the frame away for scrap metal. You may have to run a classified in the free column to do so. Once the rest of it is gone, the frame should be easier to dispose of as scrap metal.
Check with landfills to find out if there are any prohibitions on what they can take.