Flo- Flo heavy lift ships

Dockwise’s Blue Marlin has a 63 metre beam and a 73,000 tons payload capacity.

http://www2.dockwise.com/vessels/node/195?tab=factsandfigures.

If you wanted a wider load, could you get the same lift from a catamaran or SWATH hull?

Would the stress be too much for a catamaran or SWATH hull?