Since you mentioned high temps, what temp is your pentastar running at? Do they run hotter in the Rams? With winter temps mine (the Durango) stays in the 180s. Summertime causes it to run in the 190s, low 200s if I'm setting in traffic.
Conventional oil is fine in these engines. I did a 5,700 mile run on VWB and got decent wear numbers and a TBN of 2.8. Someone mentioned doing 10k miles on conventional, personally I wouldn't go over 8k. And that would only be with a good name brand oil. My latest run was with Trop-Artic Syn Blend for 6k. Wear numbers were slightly better and TBN was a strong 4.0.
If you're dead set on running dino, I'd do PYB from Walmart for 7k and call it a day.