hey, bike dweebs! I have a question that may sound a bit silly. I have a thule roof-rack system complete with two #545 wheel holder. I have them set up so that they are perpendicular to the 50lb load bar, at a 90-degree angle. I've been somewhat okay with this positioning, but I don't know if that is the right and "cool" way to have them set. not too many cars I see with roof racks have wheel holders, and the ones that do have them raked back a bit, which I think looks cooler. those who have wheel holders, what angle position do you have them in? straight up or raked back? having them slanted, is there a tendency for the wheel holders to fall back because of gravity wanting to pull them down further and therefore putting stress on the plastic clamps to which they are attached? I need to know these things! thanks!