No modification of trim is needed on the passenger van. Do not remove the trim...its a big mess if you do, its glued on with double sided tape and does not remove easily.
I haven't had a complaint or issue from any customers I have installed the bed on with anything becoming weak that I am aware of. Overall its a good design. It isn't cheap, but for what it would cost to build one of these (time and engineering effort it would require) and ease of how it installs and works, it is worth the money in my opinion if you need an adjustable bed for the average DIYer. Adwag however needs to offer a solution to drop the bed lower as a "bolt on" as part of their costs. This is an option with the newer Transit version. I have seen other versions of adjustable beds that are very similar, none of them perfect, but they don't just "bolt in" like this one.