Do you need a reservation to use the airport shuttles listed on LVA, or can you just walk up like a cab? Also , are they located in the same area at the airport?
Just show up. There will be numerous competing companies. They are pretty much the same price so you want to find out which ones are leaving first. This can be a real crap shoot. If you are lucky, you would leave in a few minutes or you could end up waiting over 15 - 20 mins before they feel it is full enough to leave.
