What could I do? Ten minutes later I was twenty dollars poorer, and the bookshelf was tied on to the roof rack. It was tall and narrow, quite heavy too.
Remove rook racks: If you have roof racks installed on your car, remove them.
Load canisters of it on the Grand Cherokee's available roof rack and you won't need to stop for gas.
Take your roof rack off your car when you aren't using it, for more savings.