If you're towing a trailer with a gross trailer mass (GTM) over 750kg, you'll be in need of a trailer brake controller. The Hayman Reese Guardian IQ Brake Controller is a fully proportional electronic braking system capable of controlling up to 3 separate axles at once. This super easy to install system features Plug & Tow technology, with a preassembled wiring harness and a snap in dash cradle. The Guardian IQ is a fully proportional trailer braking system with self levelling capabilities, this means when ascending hills the unit will automatically reduce braking strength, and when descending will slightly increase braking strength to ensure your overall braking experience stays the same. The Guardian IQ also has a 'Boost' feature, allowing for on-the-fly brake sensitivity adjustments to customize your braking strength. This is great for sudden surface changes or just to increase confidence while on the move.