They obviously have/had some drawings/templates. They knew where to put windows in the walls.
But I'm not so sure they have drawings for things like plumbing runs and electrical cable routing. These are built a lot more like your house, and a lot less like your truck. You wouldn't ask for drawings of the plumbing under the sink in your house. A tradesman does that. You wouldn't ask for a schematic of the wire runs in your house. A tradesman drills holes in the studs as he strings his cable. Your trailer is a lot more like that, than the wiring harness under the dash of your truck. It could be argued that that is a lot of the problem with quality. Leaving too much up to the "tradesman" who was probably a farmer last year.
If they do have drawings, why would they give them away? The company I work for wouldn't publish engineering material. It is proprietary.
