I have used Equal-I-zer hitches on two trailers. First one weighed about 5500 and towed initially with a Jeep Grand Cherokee. Currently towing about 10,000lbs with the 1400/14,000 Equal-I-zer with about 1200 lbs hitch weight. TV 2006 Ram 2500 CTD. I have found the Equal-I-zer, when set up right to be a very effective hitch. No sway, no push from cross winds or semis. Very satisfied in both cases.
The OP said an '06 Ram 3500 CTD and an 8000lb Airstream. I think any off the hitches mentioned should serve him well if properly set up.
