I to have a weight distribution bars for my travel trailer as well. The last year my Blazer has been in transition so I had to use my wifes expedition. I was wondering if I needed air bags, but the weight thing worked great. You may also want to shift any weight in your trailer to help, exaples put the loose stuff (bikes, toys, TV, cold beer) toward the rear of the travel trailer to held things. I also hear springs do "get old" and loose that lovin feelin over the years....Good luck
rezalB
Built for a purpose.