Just because a piece of glass is laminated doesn't make it super strong relative to a piece of tempered glass-- it just stays together when it breaks. Watch a FailArmy video. Most any one of them will have someone breaking a windshield by putting just the weight of one leg on it. Bikes are relatively light, but I"m not going to stick one to my glass hatch with suction cups, just because that sounds like a recipe for "something broken." Bike, glass, or both.
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