Guess I might chime in, although everything has already been said. From a Ram 1500 owner- those published (and even stickered) payload numbers are optomistic at best. When I actually weighed mine, there was a fairly significant difference.
The comments I offer are not to be considered "advice" or "rules" or anything that can be mistaken for "it works for me so you should be fine" because that is not the case- I know my setup isn't ideal, I don't like the situation I am in, but we plan and drive and load accordingly and make do with what we have to work with for the next few years. With my Laramie CC, I handily exceed the GVWR of the truck which is not an actual legal issue where I tow. The most important ones in my eyes (and this is just personal opinion since it's what we always have used growing up) are your axle, tire, receiver and combination ratings. Those mean business. Ideally- not exceeding GVWR is what you need to shoot for. Rhetoric though- I apologize.
For reference, hook your trailer up to your truck without the WDH then go weigh your front a rear axle. Then, with a WDH, go weigh again. You'll see the difference. Sometimes the WDH can actually keep you within your RAWR- you'd be surprised. Teh spring bars will also aid in keeping your trailer tracking true during crosswinds, being passed, etc.
I tow a 5500lbs 26' Jayfeather with my Ram. I have to report (with some embarassment) that my TV is between 400-600 over GVWR when we tow depending on duration, but under all axle, tire, receiver ratings and at only 57% of our tow rating (it's rated to pull 9650lbs) and more than 2000lbs below our combination rating. The reason we aren't upgrading our TV yet is simply because the two oldest are only a year away from leaving the nest, and that results in 500lbs less body weight, and a smaller trailer. For now, the upgraded coils in the front and rear, proper shocks, and better rubber allow us to carry the extra weight (note I didn't say legally exceed or increase payload) better. I can't imagine pulling what you are without my Blue Ox hitch and some serious suspension aids. With a 700lbs tongue weight and a full cab I sag 3" now, the bars return it level.
So, while you may not have experienced a problem yet, there are still plenty of miles ahead of you. Not sure I would chance it personally.
I am not trying to sound smug or a know it all. I tow with a Ram. The suspension is surprisingly squishy from factory. Not sure I could do what you're doing knowing what I do about these trucks. That being said, any reports I have read about the little VM 3.0 towing have been nothing but praise- so they have a winner on their hands I think, and you have a great little truck