Having to rely on a rental outfit means you'll have little chance to be totally alone on any river...some are worse than others. Niangua is bad, Huzzah, Meramec, Current, Jack's Fork, Big Piney, NFoW...just to name a few...avoid them all if peace and quiet is what you're looking for. You can increase your odds of finding solitude by coming in the middle of the week...otherwise, prepare for some company. Or you guys can throw in on a beat up used Disco for a couple hundred bucks and drag it along. And since you guys are meeting halfsies and you'll have two vehicles, you can do your own shuttle. You're bound by nothing...go wherever you want.