I store mine exactly the way Alex does.
Inside the van I have a 6ft pointer which lies on the wheel arch, the pointy end at the front of the van.
I've a 6ft triple extension ladder that rests on top of that and on the top of my 650 litre flat tank.
The stiles on the pointer help support the ladder, and on THAT I rest my bag with the superlite in.
With all the pole sections in as one section it is so easy to just slide out whatever sections I need.
If I need three extra sections I take out the three sections all still inside one another, makes carrying what you need so easy.
The bag never needs to come out of the van.
Ian