I tow a 3400# enclosed sled trailer with up to 3 sleds and gear so closer to 7000#, on 37's with no swaybar on a Bajakits 4wd long travel kit. I have deavers in the rear but airbags on daystar pads. Runs great. Little under geared but the 6.2 tugs it all pretty good and trans temps stay right around 150-170.
There is some spindle modification required (grinding) to clear the LCA on this kit. I bought the swaybar links thinking I'd install them to tow in the winter but have not even considered putting them on. I would recommend going with the dirt king kit over the Baja Kits for fit, finish, and features.