I'm planning to get a roof box for those family camping trips away, but then we are a family of just three and we currently don't take bikes with us, just a kayak and some camping gear, etc.
Of course, the bikes could go on a tow-hitch rack, if we did decide to include them.
Not keen on the idea of towing a baggage trailer though.

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Current:
2004 X5 4.8is - Le Mans blue/Cream beige
1994 E31 850CSi - Sterlingsilber

Previous:
1987 BMW E28 M5 - Delphin-metallic
1976 BMW E3 3.0Si - Arctic-metallic