Awesome Service – See Our Ratings. Rear Air Bag Tow Assist Kit W/ Controller Kit. Touring Tech towing assist kit includes (2) 2500lb air springs with brackets, corrosion proof push to connect fittings, hardware, ΒΌ DOT approved air line and Schrader fill/release valve. Remove one leaf spring and inflate the system to restore load capacity. Provides up to 5000lbs of leveling capacity. To be used on vehicles with Rear Leaf Springs.