Welcome to the forum..
If your going with a 1500 GM product pulling a trailer be sure and get the NHT package (tow package). It comes with the higher rated gvwr and rawr numbers.
A 2014 and up 1500 gm you also can choose between the 5.3 engine at 355 hp/383 torque or the 6.2 engine at 420 hp/460 torque. Both can come with the NHT package. The 6.2 engine can tow GMs 1500 trucks tow ratings with ease.
Older engine were down on power levels.
And also be aware of some GMs engines AFM/valve train (cylinder deactivation issues) with the 5.3 and 6.2 engines prior to 2021-22 ?? models. Google has lots on this subject.
My wifes has a '16 1500 chevy 4wd crew cab short bed 5.3 engine 6 speed tranny 3.42 gears (not the NHT package). IMO a 6k-6.5k wet weight trailer would be the max I would want to pull around the country with the 5.3 engine.
The 6.2 engine can handle a 7k-7.5k lb trailer.
Good luck on the hunt.