Can it be pushed to its extreme? Yes. But it isn't a good idea...
To be safe, make sure you are have a functional brake controller, and use safety chains. Then consult your owners manual for maximum trailer weight. Then never exceed that by more than 1000lbs. Also, load the most weight in the front of the trailer so it balances properly.
You wanna know what is unsafe? Before we knew about safe towing and weight ratings (yes honestly we did not know, never read the operators manual) we towed over 20,000lbs with our 1996 Dodge Ram 1500 with the original engine and trans! Yes we had a brake controller, and we did run shocks with load assisting springs, etc., and it was able to maintain 45 on the hills, albeit at redline, it towed it. But was it safe? We never had any accidents because of it, but since then I've gotten wise and educated
We got a 1 ton with a much bigger engine and lower gearing and it was a huge difference!
My point: While it might move under overload, you gotta equip it to tow properly, and then tow within reason! Factory weight ratings are not always the most you can tow safely with your truck, but towing over that may get you into legal trouble depending on your state. So use your brains! It's not about absolute max, but safety! When towing you increase your risk of accidents is at least two times greater, so better make that a smaller chance.