Mobile home frame over conex boxes to make a covered deck/covered area for tractor

[tngun]

I have a piece of land with a 28x80 doublewide - its a newer trailer, but was trashed out and left to be scrapped.

my land is hilly but I have a level spot to put a couple of conex boxes
was thinking of setting the two boxes as far as possible apart and set the frame over them - supporting one end on the hillside, a connect at 10 or so feet, and the second supporting the other end with 4 feet or so of overhang.
I then want to deck the top of the frame and use the mobile home roof joists to make a large screened in porch on top of the two shipping containers.

how do I calculate the distance I can use as an unsupported span?

I want as much area between the boxes as possible as I have a truck and tractor I'd like to store under the deck - plus the covered work area is nice.

 

[dzimbric]

This code will drive you crazy but here is a link http://www.ncdoi.com/OSFM/Manufactured_Building/Documents/Regulations/26-36.pdf

if it were me I would set the containers 40 feet apart and cantilever the ends of the mobile home frame. Park the truck and tractor under the cantilevers and use the area between the boxes for a work area.

 

[tngun]

Thanks. If I can't use the frame as the base of a deck, I will build it another way, I really want a screened in deck over the top so I can rest in comfort without mosquitos