2104s Mini Lite & weight dist. hitch
The old rule of thumb is if the trailer loaded weighs more than %50 of the tow vehicles curb weight you should use one.
So if you have a 4500lb trailer and a 7000lb truck, it could be said you could use it. I am just swagging the weights of your items.
I was in the same boat as I have a Ram 3500 and the 2109s. I thought about getting a 500/5000 distribution hitch but I haven't. I try to keep the weight in the box lower to keep the axles evenly loaded. The best way is to run it across a scale which I did with the trailer loaded and if you have a large deviance on your trucks axles then maybe consider it more.
2015 MiniLite 2109S
2016 Ram 3500 6.7