Trailer length and sway

With properly set up W.D. that includes sway control....either integrated or friction, you won't have any sway issues. It does take some time to get the right "recipe" for a good set up. Tongue weight and bars to match that. Proper tilt of the head. Ball height and weight/load distribution in the coach. Main thing is don't throw the towel in just because it wasn't right the first go-round. I pulled a pretty "lardy" meaning heavy, 25ft. Nomad all over the U.S. with a 1999 GMC 4X4 Suburban 1/2 ton. Never once had a sway or control issue. The current breed of 1/2 ton-ers are way better than my 1999 Burban for sure.

Load the tongue, reduce the sway.

I have a '19 F150 145" wheelbase, pulling a 6000lb TT (from cat scale) 28' coupler to bumper, with 900lbs of tongue weight (from sherline scale)trailer. Using an equalizer 4pt hitch and it tracks behind just fine. Had some 25-30 mph crosswinds last trip and was still able to enjoy a cup of coffee while driving.
So to answer your question 28' of trailer for a 1/2 ton setup properly is fine.

Worry more about tongue weight - both as far as payload of the truck and keeping it close to 12% of actual trailer weight when loaded and ready to go camping.

It could help if you would post your wheel base so someone doesn't have to look it up for themselves.

That said, I believe, as long as you stay within your payload capacity, you should not have an issue with sway, provided you have a good weight distribution hitch with sway control.

Focus on payload, as that is the number you will likely reach before any other number. And since you haven't bought the truck yet, make sure what you do buy has LT tires (vice P rated passenger tires).

Ram 1500's have one of the lower payload capacities of the 1/2 ton family. Especially the Laramie edition, which is the higher end. Those extra options reduce payload. If I were going with a half ton, I'd be looking probably at Ford or GM (Chevy/GMC).

Mike

The difference between my old Tahoe and my new Silverado 1500 is quite surprising when 18 wheelers and busses pass me. 116 inches vs. 147. I think you’ll be fine in a RAM. Provided gross weight and payload ok, 30 feet.