The Bob Revolution is great. It can carry two older kids too in a pinch (on a good surface). 3 months might be a little young for it without the infant adapter. For little ones like that (also bigger ones), an Ergobaby baby carrier is really good, and a regular old Graco type stroller is good for parking the baby at the camp site. It packs smaller than the Bob and you can plop baby into it in the car seat or not.
We slept with the baby in the camper. Ug. I still do, come to think of it. Working on the bunk bed this spring...