i retrofitted one for my trunk as well. very worthwhile for safely, it is impossible not to notice the large warning triangle. the obvious reason for its size is so that motorists traveling at 120+mph on the autobahn can see it readily. keep in mind the added weight of the warning triangle on the trunk lid, it will close with less force required. in fact, i can simply let go of my trunk lid now from approx. 6" and it will close rather nicely with a harmonious thump.

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Jonathan
1998 S600
2001 E430
1994 E320
1991 560SEL
1994 Turbo R