RebelThunder
Speak English or GTFO
Am I missing something or is there one question that is getting over looked?
If you are talking about Diesels, there is a very good chance it will have a 6L90 (assuming you go GM). In that case with the power of a Diesel and a 6 speed tranny 3.73's will do more than you want them to.
Since you are coming from a 1500, I think 3.73s paired with a Diesel will make you feel like you are in a Semi compared to your 5.3.
3.73s should be more than enough with the torque of the diesel.
+1
Leave the 3.73's in there.

Thanks guys, I will carry sometimes the slide-camper and never tow.
manual , I had a lot (European standard) when I was young (it was a long time
), now finish manual, my arm is tired