My dog's been on roadtrips with me in the past & she's a camping/hiking dog. As for the drive & seeing the country. I've done the driven cross-country & back twice before, so I'm not as keen on seeing the country again. I think for me, it's more of a logistics & safety issue regarding flying.
I definitely see your points about the bonding though - she'd probably like the roadtrip, as she loves being in the car. But I can also see her getting tired of it. 5 days wiht 10-12 hour days in the car is a long time (even with rest breaks every few hours)...for both dog & human.