To move a mobile home is much more involved than just hooking it up to a truck. Almost every park in our state requires you remove axels and attach it to the ground by some semi-permanent method. The cost to move a mobile home around here is about $1500 to $2000 if you're only moving it say 25mi.

It's also technically possible to move non-detached housing (Traditional houses) through the use of a company that moves houses. We've looked into it because once in a great while you find someone selling salvage rights to a house. This means you get the house but not the land. Typically it means that people go in and rip out anything valuable, then pay a company to tear the house down. Instead I have looked at hiring a company to split the house in sections, transport it to a new location and re-build it. The cost estimates I got were in the ~$20,000 range. It might sound like much, but you can buy salvage rights for less than $10,000 for a VERY nice house.

So, imagine this :

$10,000 salvage rights for a upscale house that is being turned into a parking lot.
$20,000 to move the house to a new location
$10,000 for utilities & foundation that matches your moved house
$10,000 for a nice house lot.

Total cost - $50,000

Now, if you could move a nice, well-built house that has history to a equally historical area, you could very well have a FMV of $150,000 to $200,000 which incurs a profit of $100,000-$150,000.

Granted this has nothing to do what you were talking about