Roof cargo box works great for me. Load car with 4 people 2 sometimes 3 dogs with us... go to river or dirt roads between and under trees and it is great with pleanty of room to hold everything uptop so theres room for us with the dogs...
Only thing i forgot or wasnt thinking bout it and got stuck under a parking space overhang...
Went straight under but couldnt get out without taking it off then putting it back on.
That was the only time i hit something haha but it was my fault completly not a flaw with a cargo box...

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2001 e53 5mt
Stainless steel headers
UUC short shifter
Lowered on bc racing coilovers