Can I use my same axle to put dually tires..

Can I use my same axle to convert from
swd to a dually. Or what do I need ,what
pieces expecially..thinking of removing the
bed and putting a diamond plate in the
middle pf the frame whit a 5th wheel on the
middle or probably a aluminum flatbed dont
know yet...but I really wnna know if I can
use my same axle....also my truck has a big
transmission of a v8 ...