IMHO, since I worked in quite a few manufacturing companies (none of which are RV related), typical markup out the door of the factory is that the cost to build is 45% of the sales price, and 55% is the gross profit.
Everyone in the supply chain then adds their profit, so they can stay in business. Mainly these are the distributors and the retail sales.
IF I WERE TO BUY NEW, I think I would go to the factory, take the tour, and make the deal there for the most perfect setup.
HOWEVER, to buy used, that is not the option. Spend lotsa time looking the best floor plan that will work for you and within your budget.
NOTE: If you are familiar with the popular perfume OBSESSION, which sells for well over $100 retail, the total invested cost at the dock of the factory, including packaging, advertising, et al, is a whopping $8.00.
MOTHER SHIP Winnebago View 24H (2007 Dodge Sprinter 3500 Chassis, 2008 Body)3.0 L M-B Diesel V6 bought used with 24K miles. Toad: ROCKY the Flying Squirrel.