Yes any well equipped newer half ton can safely and comfortably tow a 7klb or less TT.
And again, if the rear of the truck is a little light on suspension, there's about a dozen different products to safely stiffen up the rear springs some that are not too expensive and easily installed.
Hey man, idk if you're near Seattle, but if you are, I got a 28', well 32' with the vee nose enclosed tandem Sno machine trailer sitting here at about 6klbs loaded. Would be a good simulation of your size trailer. If you need to give a trailer a pull with the vehicle of your choice to see how it handles it, let me know.
And I think Rams are all lightly sprung in the rear, but it's not like the truck is any smaller or weaker or more prone to break with a modest load/tongue weight then one that comes with heavy duty springs. And the Hemi or the EcoD would pull it adequately.
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold