Is it more practical to install a luggage box or a luggage rack on the roof of a tourist car?

Generally speaking, the roof of a tourist vehicle is mostly empty and does not contain much.

If you plan to pack a suitcase, it will basically be empty and idle. There is no other benefit except that it will waste more oil during driving and maintenance and maintenance.

All you need is a luggage rack. If there is something real, you can bind it. In this way, you don't need to pay too much attention in normal times, and there won't be more waste.