Quite simple if you mount on your turtle mount in the elevator room it becomes a "passenger mount". That means party members get a green arrow and can mount it. The best part is that they become smaller and stand on the turtle's head. When the turtle goes in it's shell they do too.
I know I know, not much of an exploit but we laughed so hard in vent I thought the MMOWned community would appreciate it. Exploit is a way to make your group laugh
Full size images:
https://i.imgur.com/dhKcn.jpg
https://i.imgur.com/SHQS3.jpg