The question is a bit like asking how different cars or houses are built. The results are too numerous to compile easily. Construction methods of every manufacturer will vary and even within a certain manufacturer various models will be constructed differently. More expensive vs entry level. Heck even different years can be done differently. As a general rule some manufacturers are claimed to have better quality build, (solid wood instead of veneer, steel vs aluminum, or wood construction, fiberglass or aluminum skin, TPO vs aluminum roof) but pretty much every aspect can be scrutinized and differences found. It's usually best to find a floor plan you like and then back into manufacturers based on your budget or preferred construction method. You may find you want Prevost quality and have a Thor budget.