Most dealers give you a starter kit that includes a sewer hose, water hose and some chemicals for the black tank. They are starter kits and are not great quality. Upgrade as soon as you can and get at least 20ft of high quality sewer hose (2-10ft sections) and all necessary couplings.
As Phil mentioned, If you have any negotating left to do, get them to include your choice of sewer hose, water hose, water pressure regulator from their parts dept. It will save you at least $60
The 50 amp electrical cord is wired into your coach. It's about 25ft and at some point you will realize that you need and extension of at least 25ft. At about $150 bucks for 25' to 30' see if they will throw one in.
We love our Berkshire and Forest River's warranty department has been great with any problems
Marc & Jan
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2012 Berkshire 360FWS, Brake Buddy Vantage|Wineguard Travler SK-3005