These mobile FRS radios are much better than the handheld units.. That said, they still don't get enough volume to hear them clearly over the noise in my Pathfinder. I use my mobile FRS, but not as much as my CB. I find that this FRS really needs line of sight to work well... as any deviation from that really cuts the reception/transmission capability. With my Uniden CB, I can transmit and receive a crystal clear signal a good distance over rugged terrain that the FRS can't handle.

I would highly recommend both an FRS and CB in any offroad vehicle.. Most other wheelers I run into don't use FRS, so if you need to call for help out on the trail or want to chat with other wheelers in general, a CB is a good addition.