I have a cousin who has been riding as a pax with her m/c chaplain husband on a Harley for years and now for the past 3 or 4 years on a smaller touring bike (Suzuki?). They are now selling the current bike because she has arthritis in her spine, and any bump while riding causes pain that lasts for days. So, my question is: do any of you have experience as a passenger, or with a passenger, who has chronic back pain? How smooth and comfortable is an RT, or maybe a Ryker, for such a person? Since she is quite sensitive to bounces of the bike is riding as a pax on any Spyder feasible? They are both in their 70's.