My sincere advice is to ignore the complaints you read on the websites. We never hear the "rest of the story" on the complaints and in fairness to the complainer, he often doesn't know the real reason for his problems.
Many problems that do occur with Cummins HPCR engines result from contaminated fuel, maintenance neglect (fuel filters), use of non-approved aftermarket filters, or modifications made to the engines. Problems that occur with Cummins engines that are actually used for work as intended are historically and provably very small in number.
I purchased a new '06 Ram dually in March '06 when I was transporting trailers hot and heavy. I put 230,000 miles on that truck in one year and nine months! I sold it in January '08 to buy the cab and chassis I own now. I never had any problems with the '06 worth mentioning.
The FCA was replaced once. I had a qualifed dealer tech run the engine performance diagnostic test on it when it had well over 200k miles on it. He determined that all injectors were still performing fine.
Back then I could have purchased a six pack of Cummins remanufactured Bosch injectors for that engine for $1800. No big deal.
Drive your Dodge and enjoy it. Buy fuel from high volume retailers who change their filters, service your truck as the owner's manual suggests, use only Fleetguard filter products and quality brand name lubricants, and don't modify the engine with aftermarket parts. Use it for hauling and towing as much as possible. You should enjoy a long and satisfying service life as most of us do.
My '08 currently has 99,xxx miles showing and injectors never enter my thoughts. At least two TDR members, TulsaOkie and EB, have around 350,000 miles on their '07. 5 and '08 Ram trucks.