The manufacturer's MSRP covers only things shipped from the factory and does not include the tow vehicle's hitch. A few dealers may price a hitch in their "asking price" for entry level rigs, those that a first-time buyer are likely to buy, but generally a hitch is not included. Always ask about this and other extras such as "set-up", administrative fees, etc.
It's not included in MSRP. However, it's been my experieince that the dealer will include it in his quote, if its needed, so that one has a drive away price. It's been about 6 years since I last boought a TT so things may have changed. The "normal" discount on a motorhome ranges from 25 -30%; don't know if that holds for a TT.
Ours wasn't. But they claim to have 'shaved a bit off' the price because we bought the hitch setup at their dealership. We honestly didn't even check around, just wanted to get it over with all at once.
I would bet that after dealing for the best price possible if one was to let them know that you would buy if the dealer would provide and install the equipment necessary for you to drive away with the trailer they would probably do it. If they wouldn't walk away I doubt the would let you get far and if they still didn't agree then there are other dealers and you will be more experienced.