Since I haven't updated this in a long time, it seems like the Dodge dealers are no longer able to get senders for the 30 gallon tanks (there are about 20 on back order with no expected delivery date -- they said they're not dropped yet, but that isn't a good sign either).
However after doing some research there is a Mopar restoration site based just 20 minutes north of me in Fort Collins, CO that has started carrying them. Unlike the zinc coated OE units, these are stainless steel and are only $100 (for 30 or 20 gallon tanks). I got to drive up and meet the owner and his wife (they operate out of a large garage and outbuilding on their property). Very nice people and although they don't carry much for the trucks, he said the senders have been selling like hotcakes since they started carrying them in March (more than any they sell for cars, etc)!
Their website is:
http://www.521restorations.com or eBay store:
http://www.ebay.com/itm/121614122663 (30 gallon sender for reference).
Attachment:
521 Restorations - 30 gallon sender - FG8187T30.JPG [ 52.64 KiB | Viewed 9517 times ]

(filler neck grommet replaced too as the old one was in bad shape)
I also removed the electric fuel pump from the truck as well -- for one it was mounted above the tank (where the installation instructions said this Carter was supposed to be mounted lower than the tank) so it was constantly working too hard which I think made it wonky. Basically it was getting starved for fuel once it'd been running for a while and the vehicle came to slow traffic or a stop.
It was installed prior to me buying the truck -- and I never liked the fact that if the ignition was switched to on it was running. I had never paid that close of attention, but it looks like the new mechanical pump that was installed with the new engine was bypassed. I'm not quite sure why, but I'm assuming the creased/nearly folded over filter on the old sender was the culprit.
With the electric pump removed and a NEW mechanical pump installed it seems to be running great! I also took the time to replace all of the rubber lines back by the tank/frame rail as well as up in the engine bay.