Air bags and an Anderson WDH. The Anderson will give some sway control with just the weight of the coupler on the ball. You can still add some WD with it, but you could add just enough to add some friction to the WD and not put a lot of pressure on the receiver. It's also very light. Bags will help with the added load. If it tows fine and you're not over any tow ratings then go for it.
If you were having sway issues and loading issues then I would say get another tow vehicle. But since it tows fine then just some tweaking would be in order.