Although Bakalite is made using formaldehyde, it doesn't CONTAIN any formaldehyde in the final product. Sorta like saying that water contains oxygen
- true from a certain perspective, but you wouldn't wanna try breathing it. Even if it did - Bakalite is used in relatively small quantities (especially nowadays) so any unpleasant chemicals that might be in it - are going to be in fairly small concentrations.
The issue is that the trailers are using fairly large quantities of material that's going to off-gas junk AND it's taking place in a very confined space which probably isn't very well ventilated. That's going to drive the concentration of the nasties much higher than they're going to be in your typical home.
Course, at home we try to avoid using the sorts of materials that are the worst for dumping junk into the air. It can be moderatly unpleasant - plus most of the worst offenders are pretty junky material anyway. Glorified sawdust with pictures of wood glued to the front.
Darn stuff melts if you get it wet.