Thanks for the info... I just signed up.
One thing I noticed: The initial text to confirm my phone number said max of 4 messages per rental, then the text confirming my enrollment said max of five texts per month.
I have unlimited messaging so I'm not worried about the number of texts, but I rent 2-3x per week so I can't figure out if my messages will be capped at five or if those are on top of the up to four rental-related text per rental.