I too have tried to install a Thule roof rack and the doors will not shut. I used the 56 fit kit with 400 feet (which is the correct fit kit). I have used that rack on two different Nissan cars with no problem. I e-mailed Thule and they sd to take to a Thule dealer in my area to diagnose. Thule makes an awesome rack system so hopefully it can work my my 01 Ranger reg cab. If I find out anything else, I will poste it.