If wondering, I installed the brake controller within my own vehicle. Also installed my own aux ATF cooler. Also installed its 7-pin connector and also installed its Trailer brake wiring as well. For me, this DIY tasks are easy. But... I do understand that some folks don't like doing their own technical installs / upgrades.
Couple of things must be confirmed before pulling your TT down the road.
First, one must ensure the current condition of the Trailer's Electric brakes. And, these brakes are in proper condition and in proper working order as well. Just because a trailer "has" brake hubs, it doesn't mean that specific trailer is within a "connect and tow" readiness state. Each of the trailer brake hubs must be removed, its inner brake shoes / magnet thickness must be confirmed, and all internal rust must be removed as well. For more details, surf: http://www.etrailer.com/tv-demo_trai...nspection.aspx
Second, the Brake Controller must be properly installed within your TV (Tow Vehicle). For more details on your "2011 Chevy Silverado XCab w/tow package" vehicle, do contact your nearest GM dealer. For info on how to install Brake Controller within older Chevy Silverado, surf: http://www.etrailer.com/tv-brake-con...silverado.aspx
Note: If you contact etrailer directly, they can confirm if 2005 is the same install on your 2011.
The 3rd item is to ensure the "brake wiring" from Tow Vehicle's Brake Controller to 7 Pint Connector. And from 7 Pin Connector to each brake controller hub is working properly as well. Luckily, the P2 and P3 Prodigy Brake controllers display error messages when this wiring path is faulty.
If you are uncomfortable with Brake Controller installation, Brake Controller wiring (from Tow Vehicle to Trailer's hubs) and with Trailer Brake visual inspections / testing, do ask certified mechanics to perform the work. Many RV and Auto Shops will perform brake work on both vehicle and your trailer.
Hope this (and provided video links) help...