what kind of extra cargo/bike storage do you have for your minivan?

We are not hardcore bike people but at least one a year we go on a trip where we want to bring kids bikes, a double stroller, etc. and when our kids are older we probably do some tent camping trips which are also gear heavy.

Next summer we will have a third kid, so we will need to leave a seat in the back row down. So far we can get everything in when the third row is down but soon we will lose that option.