Don't blame the electro-magnetic shock system for the poor ride you have. I have no doubt that the rough ride is due to your stiffer lowering springs. Spring rates are the biggest contributor to ride quality. A sporty ride is directly opposed to a soft ride. Didn't your Denali ride much better...
This is an Ebay add for a 2015 plug and play controller with harness:
GM part #19330154 also available at dealers
http://www.ebay.com/itm/15-16-Tahoe-Brake-Controller-Package-Curt-Triflex-Proportional-GM-19330154-/381254110881?fits=Year%3A2015%7CModel%3ATahoe&hash=item58c4840ea1&vxp=mtr
Here is the 2015 Tahoe "Plug and Play" brake controller for $100 shipped.
http://www.ebay.com/itm/15-16-Tahoe-Brake-Controller-Package-Curt-Triflex-Proportional-GM-19330154-/381254110881?fits=Year%3A2015%7CModel%3ATahoe&hash=item58c4840ea1&vxp=mtr
GM part ## 19330154 Other brands are also...
I should have ordered a Z71?
The "build your own" website shows an optional Curt brand (aftermarket) brake controller that you can now order with your vehicle or buy later. It has the correct wire harness to plug into your vehicle.
I ordered my 2015 LT with max trailer option and the ride...
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