Tippple wide foundations

[Bill]

What maks up a foundation for a tripple wide verses a double wide.
How do you figure the number of running feet under a tripple wide.
What is a "normal" cost per foot for a foundation in the northern part of California.

I hope you can understand my question.

Bill

[Roy Bonney]

The difference would be an additional marriage line. This would entail additional column supports at the required locations. Only a local contractor can give you an accurate cost estimate to perform this work.