I have a 2003 Tundra V8 Access Cab with towing package. I need help deciding whether to replace the leaking airbags or install a weight distribution hitch (WDH). I have a 25ft travel trailer that is 4200 dry weight. I have an add a leaf and the Air Lift 59530 Ride Control airbag system. Both bags are leaking. Without the help of the air bags my back end sags badly. I have read that a WDH system is preferred over airbags. What WDH system should I install? If I install a WDH do I have to remove the airbags? Also seems some WDH systems don't allow backing up? I really appreciate some help making the decision? Thank you!