I currently have an 09 Jeep JK with Rotopax strapped around my tire with original bumper, etc..From my perspective they work as advertised. I drove from Chi- California with them on the back. Once in California , I went to Death Valley, Mojave Desert and Joshua Tree and have done the trails. They stayed on and had no problems off-roading. I was caring 2 3 gallons on each side. The ONLY problem is once there on you can't open your rear tail-gate. The pax obstruct the door handle, so you have to take them off to open the back. Thats a pain. I imagine if they were attached to a swing-out tire carrier that wasn't attached to the door then it wouldn't be a problem. But, I'm upgrading to the AEV bumper, etc.. so I won't be needed them anymore.