Bricks, Masonry, Asphalt and Concrete - permanent foundation replacing blocks

I'm interested in buying an older manufactured home (approx size 14' x 35') on private land. I want to install a permanent foundation, I believe it is currently on blocks. What is the difficulty level, roughly estimated cost and what machinery would be required?
Any thoughts are greatly appreciated.

I assume you are dealing with a structure supported by block piers and are going to leave to house where it is and use existing utilities.

This is not a DIY project unless you recently escaped from the funny farm. - Too many potential code problems with electrical, plumbing and heating/cooling. Others have learned by experience.

I would suggest contacting a contractor familiar with "underpinning". He will probably support the house maintaining the connections and excavate for whatever type of foundation is needed. He would be familiar with how to temporarily support the structure (which is not built like a house). Make sure he goes deep enough to get below the frost line, if any. If he has to go deep (3 feet or more), I imagine he may go under with a skid-steer in the interest of long term economy and suggest a full basement.

Getting a permit for this kind of job is an alert for the building inspector and the question of allowing code variances being "grandfathered" in and could change your mind about the purchase.

Dick

what did you find out ?????