There have been many posts and threads about multi-day trips with two people on 12-13 ft. rafts. I think 3 people & gear sounds like too much. At that point you lose some of the maneuverability of the smaller raft, and that's one of the main positives about a smaller raft.
"We are all visitors to this time, this place. We are just passing through. Our purpose here is to observe, to learn, to grow, to love....and then we return home."
Australian Aboriginal Proverb