I've seen a lot of Thai videos on my social networks, I think they're viral, it's too dangerous. they are too many and still manage to pass safely, as in many of the Asian vehicles the only limitation on people who can climb is the space available. If you fit, you can go up. But also. You hook up where you can or you climb on the roof. There is also no restriction on your luggage. If you carry a backpack you are welcome and, in the same way, if you transfer chickens or sacks of rice.