^Buried is the wrong terminology for sure.
No, the OP doesn’t have the ultimate hauler, however that trailer is not only within the rated capacities of his truck, largely or even completely, it’s certainly not anywhere near the limits of the gvwr gcvwr or drivetrain capabilities.
Replacing the city slicker rear coils with some real springs is a great idea if this is a long term hauler for the OP and they’re ok with rough ride empty. (Most people with half tons aren’t primarily loading heavy, but the exact opposite.)
Coils are a relatively easy and inexpensive upgrade that are frankly needed on this model of Rams. But that or bags and good tires will help tremendously and I’d recommend it.
It would be easier if the OP actually provided answers to the other very pertinent questions asked.
Oh and if you want to test the good tire theory, air up the (presumably) stock P/XL rated tires to 60-65psi and take a little run. It’s a good simulation of how much the higher pressure and stiffness of LT D or E tires will help the situation.
If we ever find out enough details to know the whole situation….