I have the ez over - on the front bumper. When I'm not using it, it folds over the bumper (parallel with the windshield). Haven't had any issues with it (also using a Wilson flexible antenna - it's VERY flexible, so I don't think I need to worry about anything breaking).
(Oh, and I don't have any spring mounted)
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"Nature has constituted utility to man the standard and test of virtue. Men living in different countries, under different circumstances, different habits and regimens, may have different utilities; the same act, therefore, may be useful and consequently virtuous in one country which is injurious and vicious in another differently circumstanced" - Thomas Jefferson, moral relativist