Technically, these springs won't effect your Explorer's GVWR or GCWR. Practically though, you may run into a few issues. Namely, these springs lower more in the rear to eliminate rake and provide a leveled stance during normal street driving. This is an issue when towing or hauling, since the rear suspension squats a bit when loaded, so you'll likely end up nose-high when towing. If you to and haul pretty heavy on a regular basis, you probably shouldn't use these springs.