Dodge truck with going to an aluminum drive shaft..

The two piece rear drive shaft I have now is
in need of repairs..  Been looking around
for used ones and such and see they make
aluminum drive shafts that are one piece
which would eliminate the carrier bearing.  
Does the one piece aluminum drive shaft
harder on splines in the transfer case and
the yoke of the drive shaft since it doesn't
have the support of the carrier or is it
actually better to have the aluminum drive
shaft versus the heavier original no matter
if the truck hauls heavy loads or a daily
driver?  And does have the one piece shaft
affect purchasing a lift kit in the future?  
Any input is appreciated.  Thanks.