Step 1. Call in a peg vehicle/aircraft
Step 2. Go to the vehicle
Step 3. Call in your R/C bandito
Step 4. Press the left and down D pad at the same time and then press triangle to exit the bandito while still holding the left and down D pad
Step 5. While still holding the left and down D pad walk up the the aircraft or vehicle
Step 6. While still holding the left and down D pad press options for the interaction menu
Step 7. While still hold the left and down D pad exit the interaction menu and press triangle to get into the vehicle
Step 8. Let go of the left and down D-pad and Press R2 to drive it.
You're now OTR and can drive around. This can be useful for trolling or picking up other plays.