Originally Posted by Rodney

Depends on the single wide. Most old ones that I've been in have tiny second or third bedrooms, in the neighborhood of 8x8 ft. The older ones were also made with a 2x3 shell. Not much room for insulation on those. As storage they would be fine but you might find the costs of keeping an old one warm in the winter and cool in the summer excessive. Some also had aluminum wiring in the walls. I remember that being an issue but I don't remember why. If you're talking about one made after the 70s some of these issues will be gone.
Rodney