I wonder if there could be a workable idea here or something.
The idea is that one could perhaps train locals in making caravans. Like a startup. I’m guessing here but I think making the homes mobile will not set the cost of the them rising beyond the income the target areas.
People need homes. Even if they are not the regular apartments. Caravans could serve a purpose.
If for any reason your safer living somewhere else. Because of the weather like flooding. A movable caravan would serve a purpose. Especially in the Philippines.