I've found that most of the places in New Orleans people tip leaving it off and again when picking it up. Just give half of what you would tip each time instead of all of it at the end. But do what you want to do. I tip a little more because I have someone with me with a walker that needs additional help getting the walker out, etc. Someone who gets walker out of the back (or puts it up) and helps an elderly person with oxygen navigate and get settled deserves more from me than someone who just jumps in the car and drives off. But that's me.