I have 2014 Ram 2500 4X4 . It has the linked rear suspension with coils . I'm pulling a 36ft Gooseneck enclosed/toyhauler trailer . When I hook up and lower the trailer to the ball the truck is dropping about 6"+ . Are the Air Bag kits I'm see the answer to my problem or is there a better way to go . I see some have onboard air and others I guess have to be pumped up from another air source . Thanks for your input .