I've also seen nearly the opposite where these modulars come through with plywood behind interior wall sheetrock for trailering without cracking. This could be an issue if you expect to pull a through the wall maneuver.I was shocked recently looking at a modular home after a fire. Behind the sheet rock their was no insulation small studs that had tyvex attached to it and then the vinyl siding. I couldn't believe their wasn't any plywood or anything between the studs and siding especially in the northeast with nice cold winters. I think I defined the home as modular corectly it was one of the houses thats built in two sections brought in on trailors and assembled on site or is that a double wide? Regardless their garbage and a death trap.
Good luck on your paper.