Mine also is the Ram Van 3500, but with the 5.9 engine, also with 4-speed automatic. We purchased it last November and have recently returned from southern California and Arizona for 2 months and 6,000 miles. We had no major issues--I was pleased with the handling in heavy California traffic. But the one issue that concerns me most right now is roof leakage. I do not find any major caulking problems, but I will probably have to re-caulk it to be sure. I have watched several YouTube videos, so I believe that I will give it a try. I will post other issues as time goes on.
Thanks for replying!