Yes,jacking under the center section can loosen the axle tubes,I have seen this,tho not common,often the result is premature tire and bearing wear.
Gearing is a good place to start,depending on primary use,3.91 gears are a good balance.
You can jack under the outer axle tube or spring plate,under the control arm(depending on clearance) or k member or under a flat part of your frame.

 

Thank you moparborn, and everybody.

I locate jacking point and change one rear tire. Next week go with my RAM to visit friends.

See you !

 

I've been jacking cars and trucks up since 1952 many times with the jack under the punkin and have never seen an axle tube come loose.