Ask if they're installing vapor barrier under the home (in VA it's become code) Clarify who's responsible for what damage during transport.

If you require this type of data to make a move, then I'm sure you are sitting there in vapor lock all day trying to accurately use whatever it is you think a CAP rate is.For everyone else, apologies for the post but this misinformation just rubbed me the wrong way.  

Finally, cover the crawl space soil with a plastic vapor barrier.I like the remove baseboard and bottom two feet of drywall.

I will likely keep the carpeting in the bedrooms but is there something I can do to further protect them like laying down a vapor barrier between the carpet and the carpet pad?

Between the inspection ($595), encapsulation paint and cleaning ($1,900), air duct vapor treatment ($700), and another inspection to receive certification ($250), I'm wondering if all of this was necessary. 

If so, you may want to consider installing a vapor barrier, but this could get a little pricey.

Technically you should use a product such as stego mastic then cover it with stego wrap (a vapor barrier plastic sheeting that is basically rip proof) This must be from the top to the bottom and it will not be cheap.

What about the vapor barrier

You must ventilate otherwise you will condensate water vapors in this space. 

This will give you a vapor barrier under the floor.