When my first DD was born, we had a eddie bauer carrier. I thought it was the best, and that Layla just hated the car. However, she was about 4 months old when we installed the britax marathon, rear facing. She slept for over 4 hours. It was a lot more cushy and comftorable. I would ditch the carrier for a long trip, and opt for the more comfy seat. My parents live 6 hours away, and we've already went twice to see them with new DD, Maggie. She's only 8 weeks old. We're going to switch from carrier to britax roundabout for next trip.