Does the Equalizer and Timbrens do anything to compensate for the payload?
Yes, they make the towing feel a little more stable, but, they actually reduce your payload, by the exact amount of their weight. Everything and everybody, you put in or on the truck (since it left the factory), reduces your payload, pound for pound.
Do check your loading sticker, and get your scale weights. Do to variations in cab configurations, drivetrains, powertrains, suspensions, tires, and factory tow packages, your Ram could have payload as low as 1000 lbs, or high as 2000 lbs. Scale weight will give you a much more accurate picture of your available payload.
It's possible, you're not overweight, it's also possible, you're farther over than you think.