I don't know what is the safety law in Taiwan is like but I know here in the state if an camper manufacturer wants to modify a Van it needs to be certified by the original manufacturer because when designed the van for the Americas market It needs meet the safety standards just like in Taiwan camper manufacturers will install the windows on both sides but it requires to open few big holes on both sides and that will make body less rigid so when the Van is on the road the body will flex because it has two big holes on both sides 😅 MB is very strict on how to modify it's Van and there are some requirements for it like opening a hole in the roof for the AC unit and the ac is a whole unit with everything inside 😅 and with enough lithium batteries It can run all day 😅 MB Ford and Dodge RAM chassis are the most popular for camper manufacturers MB will it's a Mercedes Benz and it carries certain altitude for it just like their cars 😂 Ford and RAM are More for the regular people price wise 😂 but Toyota hiace and VW California are not available in the state 😢 those are more fitted for the Asian and European market because they are smaller I rather have a smaller Van than the big ones 😅