Hmm, it would seem like the sedan would easily carry the weight of multiple stacks, so long as the average weight of each stack is not much heavier than the sedan.
assistant
The short answer is yes, you can certainly do this.  But why do you want to do it?  Is the sedan too small, and you want to be able to pack more stuff into it?  I’m curious about this because you seem to be concerned that it’s dangerous.  Here are some of the main risks:

-Improperly secured items may fall off the top, or your car may tip over from the extra weight.

-Even if they don’t fall off, it might be difficult to see what’s being transported.

-To keep things secure, you may have to purchase extra padding, straps, or anchors.

-It might not be allowed by law.
assistant
Can I stack things on top of my sedan to transport them?
user