Remember to not overload the roof, I am sure it will have a weight limit. I think we were just under the weight limit of the roof of our zafira (not the weight limit of the roof bars) with the roof bars, cycle carriers and 4 bikes (1×160, and 3 hardtails). Maybe this year we will have to start removing bits from the bikes to stay under….
In winter we also have to make sure not to overload the roof with a large roofbox full of stuff, we tend to fill it with bulky but not too heavy things.
I remember some time ago they had a feature on breakfast tv about this very subject and put a family car packed for holiday on one of those weigh bridge thingys (2 parents, 2 kids, roof box and rear cycle rack with 2 bikes i think) and it came very close to the load capacity of the car (or just over, cant remember).
I think the car would survive (although the last service incuded a new spring for our zafira), but i always worry about the hassle if you have an accident and the car is overloaded like crazy…
I should be glad my kids weigh 32 kg each! (at 9 and 11, bless).
Isn’t the weight the ‘allow for’ per person in a car only something like 75kg?
Anyhow, use common sense! just pack a pair of pants and a toothbrush and you will be fine.