TS please measure your car internals before proceedings. Some Ikea packages are rather long and narrow.

There is only 1 carpark, split over 2 floors (P1 and P2).

The loading bay for customers is located in P2.
The problem with going there alone is this:

1) you picks your stuff from warehouse, go pay at cashier, then push trolley to loading bay
2) you must find a trusted person to jaga your trolley , because you need to walk to your car nearby* and drive it to the loading bay
3) you load your stuff into your car and cabut.

On weekends... parking are limited. So the nearby might be 200 metres away.