We've agreed on good numbers for a new Big Country 4010RD with a dealer and we're heading over to sign the paperwork to get the build started. This is our first RV and we're wondering what's next. I know the dealer will push the extended warranty, but is there anything else we should expect? Any other "gotcha" to look out for, or any other way the cost might be higher than what we've discussed on the phone? I'm already tracking freight, dealer prep, taxes, & title/doc fees. What am I missing?