I threw a Phillips & Temro oil heater and P&T transmission fluid heater on her this summer, realizing "winter is coming" and it would take a while for GM to sort things out. I also have P&T battery heaters. I tied all of this stuff together into one Noco shore power outlet mounted in the bumper valence (see picture). Once I get the block heater recall done, I will add it to this circuit. Total amps will be ~10.7.
Also threw a Noco waterproof marine grade battery charger on her, powered on a different circuit through a second Noco shore power outlet through the bumper valence. I built a bracket and mounted the charger behind the front bumper.
2017 GMC Denali HD Duramax - Deep Garnet Metallic Exterior, Cocoa/Dark Sand Interior
Kryptonite Front End Leveling Kit (UCA, Center Link, Tie Rods, Idler, Idler Arm, Idler Bracket, Pitman Arm), Fox Shocks, Bilstein Steering Stabilizer, Front Diff Drop, 20" Fuel Sledge Wheels w/ BFG T/A KO2 285/65s, 2" McGaughy's Drop Shackles, Amsoil Dual Bypass Oil Filters, MBRP Stainless Exhaust, Revolver X2 Tonneau, Morimoto XB LED Fogs, Custom Grille, Wolo Air Horns to Replace Factory Horns, Kleinn Train Horns w/ On-Board Compressor, Edge CTS2, Rostra Heated Rear Seats, Aluminum Liquid Pedals, Mag HyTec Rear Diff Cover, Clear Bra 18", Front Doors Tinted 20%/All Other Windows & Sunroof Tinted 40%, IntelliHaul mirror cameras and front cam.