Maximum legal capacity for the most demanding builds. Ideal for Tray Canopy builds and for the customer who wants to run 35" Tyres legally. GVM Increase: 4250kg (approx. 1672kg payload) upto GCM Increase rating 8750kg * ZR2 8450kg. Key Features: Fox 2.5 Performance Elite suspension, ORI 400kg leaf packs, and required load-rated wheels/tyres. Best For: Fully built rigs with rear drawer systems, rooftop tents, and long-range tanks or the ultimate tourer with Tray and Canopies fitted. Benefit: Massive payload increase that transforms the Silverado into a true heavy-duty platform while retaining 4.5T braking towing capacity. Note: Chevy Silverado ZR2 has reduced GCM due to the 4.2T towing capacity.