I am sure there will be lots of opinions on this and I hope you can arrive at a conclusion.
Yo probably don't need the weight distribution but sway control is another matter. Let me put it this way, I had a hybrid trailer that was 350# / 2900# light, but on the scales and loaded for camping that came to 600# / 3800 #, tongue / total weights.
It had close to 16% on the tongue and the recommendation is 10% - 15% to minimize sway, aside from any anti sway function. I had a WD w/anti sway hitch and had no issues.
Sway is a resonance instability phenomenon caused by many factors, all having to do with the trailer, its air profile, its loading, speed down the road and so forth. Once it develops and the speed is not dropped immediately it can increase such that the rig becomes uncontrollable. You or I don't want that, I can assure you. Best to avoid the natural frequencies in the articulated rig in the first place and the WDH w/ anti sway changes that significantly so that it is nowhere near resonance.
Based on my experience - yes you need to (a) adjust your weight balance properly and (b) use a WDH with sway control to eliminate all sway at normal speeds. I have a WDH with anti sway built in on the current RV as well and that too is well balanced and does not sway.
