I just helped a buddy do an install an his '09 Dodge 2500 Heavy Duty and it actually was easier than any Ford install and not much harder than a GM install.
You need an LTA04770B Undercarriage, and a MSC09993 Light Adapter Kit, which he picked up at our Local BOSS Dealer for $560 + tax.
I have some recommendations:
-set-up the truck on jackstands in the front, remove the front wheels,
-remove the drivers side fender well from the inside,
-remove only the front bumper (pay attention to its mounting bolt position)
I took some photos of where I mounted the Main relay pack, the solenoid, and the Turn Signal relay pack, along with where I ran the wiring harness both under the hood and into the cab. I am anal retentive about having an install looking clean and straight from the factory. The Dodge trucks still require you to drill 6 holes into the truck frame, but are all very accessible.
Hope this helps, and I think your dealer is charging way too much money for the package...
They should be charging about $500 total for the install, and even retail on the parts you need are $620.