I tow with a 3/4 ton cc, short-bed. Pretty close to your's. Eventhough the truck can handle the trailer without a W/D hitch I use one. I prefer the safety of the increased steering wheel grip combined with the better ride we get with W/D. I wouldn't tow our A/S without W/D. Sway cntl. is another story.
With any type W/D there is some intrinsic sway control. You can add friction sway to many and a few have sway control designed in, ie: Reese Dual-Cam, etc. I don't use a Hensley, but it also is a W/D hitch with 'advanced' sway control. The design and balance of Airstream trailers is so superior my experience has been that, IMHO, sway control is not a 'major' concern. I feel for most tandem axle A/S trailers with an adequate tow vehicle friction sway is sufficient, any more is for peace of mind, personal decision. This can get to become a religious discussion, there are many threads on the subject, but keep in mind weight dist. is a mostly different consideration than sway control.