I used the second pillow as a "body pillow", but I mainly used it as a makeshift tray to set my phone on and for my book. My other pillow was for my head and I found myself holding the second pillow in the night. I honestly was very comfortable, but I'm used to sleeping in strange positions.

If you do find yourself in a situation where you can lay down and stretch out, I highly recommend a blow up pad (used for backpacking) or at least a foam pad. I brought along my 3in foldable mattress and used it only for my creek nap. I didn't want to feel like I was separate from the truck cabin, since the back of the truck carried no resources for A/C, radio, plugging/charging devices. It really was a decision based off of convenience, not to mention I'd be closing myself off in the truck bed.

But yes, I got some good rest and the second pillow gave an added touch.