Good evening, when you look at the trip Rally Point, go the Attendees tab and click on it. This will show you who ha signed up and he total vehicles. At the top of the section if spaces are sitill available, you’ll see an option to click Going or Not Going. If the option doesn’t exist, the trip has reached its limit set by the creator. Check back frequently as people’s plans change and sometimes have to back out.…ask me how I know :(. Also you can message the trip organizer in the trip chat to determine if any additional spots may become available or keep you posted. Hope this makes sense and helps…it was and still is a learning curve for us. All the best!