Whatever you buy watch the payload.  Ram's are notorious for having extremely light payload as the crew cab and 4 X 4 add a lot of weight.  I'm guessing your 5,600# dry weight trailer will have a GVWR of around at least 7,000# and you will likely load to close to that.
If so you will have a proper tongue weight {13 percent} of 910# + another 100# for the weight distribution hitch which comes to 1000+# before you load anyone or any thing into the truck. A 1500 will do it depending on where you travel but it will need at least 1500# of payload and I have seen some Ram 1500's with less than 1,000.
Keep in mind that 30' of TT is a lot to ask of a half ton truck when the wind blows and/or in the mountains.  Good luck.
:C