When I was getting quotes for our 2016 Ford Focus, we got similar quotes from CW and a different RV dealer. I don't think I got $4000, but closer to $3500. Our CW agreed to install at their labor rates (just under $1000) if I bought the stuff myself. Buying the stuff myself, I would of been able to save around $1000 (savings in price differences and shipping cost). Was still going to cost us north of $2500. Opted to not go that route. We don't full time and I didn't want to have to spend another $1000 or more to have to set up a different car if we switched cars...
