Haven't used one on the PT but as long as you don't exceed your GVWR you should be fine. You will get more drag and wind buffeting from the cargo box but that should not be a major problem.
As you stated, keep the heavy stuf inside so you don't get even more top heavy. We all like a low CG.
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2003 Almond GT AutoStick, body colored rear splash guards and hood struts, chrome gear shift, AC & vent knobs, billet steering wheel spokes and pedals, AMX1397 Turbo-Intake Pipe.
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