Note that browsers are not consistent in which side they display the vertical scrollbars in RTL documents. For example, in Google Chrome, our RTL forum shows main body scrollbar on right hand side while scrollbars in other elements like menus show it on left side. And as far as I know, browsers differ in this behavior. There might be some CSS properties to instruct the browser where to position the scrollbar though (that I am not aware of).
In the picture below I have highlighted horizontal scrollbar, small right padding and large left padding.