By doing a little research there are covers that fit the Motorola Razr that do not have to be removed to fit into the car dock. I found them on Amazon. One of them is the Diztronic Matte Back Black Flexible TPU Case for Motorola
Droid Razr (Verizon & Rogers). The other is Amzer Luxe Argyle High Gloss TPU Soft Gel Skin Case for
Motorola DROID RAZR
According to the reviews you just need to remove the "case insert" in the dock. I have not tried either of them yet so I am not endorsing either. Just wanted to put out what info I got when researching cases for my Razr that I have not purchased yet. The above info is for the Razr only, not the Razr Maxx.