Dave,
Robin Carriger is very humble and rarely ever toots his own horn. That means it's up to the rest of us to do it for him.
If you are looking for high quality, low cost guidance (mentoring) on how to do small rentals profitably, I STRONGLY suggest you contact him personally and ask him to mentor you. It's RARE to find someone who has been in this business as long as he had, with his depth of knowledge and experieince, who is ALSO still willing to bend over backwards to help his students.
Best regards,
Greg Wilson ("The REI Mentor" - www.reimentor.com)