Will these be mobile/manufactured homes or modular homes? They are not the same thing. 

Modular homes look similar to stick-built homes but are built in sections inside a climate-controlled factory. Modular homes arrive in sections on flatbed trucks and are then set in place onsite and finished.

Mobile homes (aka manufactured) are single- or doublewide trailers mounted on wheels and less sturdily constructed. 

This mislabeling perpetuates the notion that modular homes are inferior, when in fact they meet modern building standards and are usually very energy efficient. Modular homes have the added advantage of being built indoors instead of exposed to the elements and vulnerable to rain and mold.