Then there is the trusting level... be sure that it's supportive enough that if she lean on it at speed at the g's you can do in a rocket versus a Harley, it won't break in half... maybe to tall to be only secured at the bottom
Its surprisingly bery stable. It is mounted at 6 points, the four regular points plus the two straps at the very bottom. We went for a 2 hour ride today and gave it some just a few times without any problems. I do plan to make one shorter to see if shes ok with it. It will be less ugly and less leverage on the the brackets. We shall see.
Well we went for a 2 hour ride today which we have mever done all last summer because after an hour she has had enough. The combination of the new seat pad and back rest has made a huge difference.