So my wife and I became camper people about a month after I purchased my 2104 Regular Cab Silverado. Our 'yellow sticker' camper weight is 7800 so even loaded I was well withing my trucks specificati...
There is a warning in the 2016 Ram manual on page 689 recommending a WD system if the trailer weighs over 5000 lbs. It doesn't use the word "requires" like it does on trailer brakes for trailers weighing more than 1653 lbs (odd number. I'm still not going to put brakes on my utility trailer).
As far as using a sleeve for a 2.5" to 2" adapter, at least on mine, once the WD is set up there is no slop in it. I only notice slop when I don't have a load on the hitch.