If you had your own group and wanted to bring your own horses, instead of using mine, we would have to arrange that ahead of time and schedule a date or dates. I don’t have separate stabling- the horses would have to be kept together in a large corral. Then we could ride at a pace you are all comfortable with. I’d have to schedule your group at a time I did not have any other rides and a gaurantee of at least 5 riders. As for the mountain roads: you can drive south, via, Casper- Shoshone- Worland, and avoid the mountains. Let me know if you have any more questions.