TT, 5ver payloads, "can my truck tow this" threads aside, it is fairly well documented that our RAM's (well, I used to have one) are the lightweights as far as payload due to their superior ride. If you really want a TC, especially a wet one, better buy an F150 with HDPP (heavy duty payload package) or whatever the equivalent is with GM cause RAM ain't got it.
Now that's if you care to follow the yellow sticker. If you don't (and many don't) then try to keep your TC below 2K loaded weight, use air bags so you don't blind the astronauts in the space station and drive slower than you want to. (Air bags don't increase payload, just level you.)
Rules, or motor transport DOT laws/requirements are for commercial vehicles. We rv'ers and general folk have been "breaking rules" or otherwise not following common sense on vehicle loads for decades, and likely will until the powers that be figure out that they can raise all kinds more revenue by treating us like they do commercial vehicles. Hope that day never comes but as the gubermint' keeps looking for more revenue sources... hmm.
Years ago, (in the late 1990's) I resided in Canada. I had a1 ton CC that towed a 24' TT (wood framed so a bit heavy but it ran on p-rated car tires for years without a blowout). We were stopped around Revelstoke BC at an RCMP mobile scale checkpoint. If you had a half-ton with too big of a TC or trailer, you were sidelined. The officer just walked down my drivers side, looked under the truck at the 10 leaf spring pack and motioned me on. While it didn't happen often, it did happen.
I've never seen any LEO's do that down here, but I betcha' the day will come.