With the WD Hitch I don't think you'll need airbags. I just relized this is from Feb so you probably got it done already. A second Trans cooler and temp guage can only help. The prodigy is a great controller, I have 2 one for my Truck and one for my Durango. I recently pulled a 6x12 box trailer 350 miles with about 4500-5000 lbs including the trailer, 3800 without the trailer, I also had 3 adults and 2 children as well as 4 days worth of clothes and the sort inside, combined weight was almost 11,000 with the Durango and trailer both loaded. It did pretty good. I noticed a little sway but that was due to poorly loaded trailer.