I have the 3.55; don't think I would want to pull much with the 3.21 judging from today. That is, if hills are involved.
Don't know what the trailer weighs, it is a 12" utility with double axles.
Yeah, I suspected a hemi would have done just as good or IMO better due to the hills. But I didn't purchase this truck to tow and have an older 3/4 ton for that. But for a 4-wheeler, riding lawnmower, small trailer, I think it will do OK.