When we were there in February, most all of the vehicles were not sticks but automatics. They allow only 4 per vehicle. We were a party of 3, so we had one to ourselves. I'm not sure, but depending on how many sign up for this excursion, and how many "jeeps" they have available, one of you might get paired with someone else. There were only a handful of actual Jeeps, the rest were like Trackers and little SUV's like that. You might be able to swing 2 in one, and 3 in the other.
Have a great time!
Robin