2025 Gmc Denali Ultimate 2025 Dually. As we can see from these tables, the 2025 gmc sierra hd model with the highest towing capacity rating is the 3500 hd regular cab / long bed drw (dual rear wheel) with. Thanks in large part to the 6.6l l5p duramax mated to the allison.
Thanks in large part to the 6.6l l5p duramax mated to the allison. The 2025 gmc sierra 2500hd denali ultimate carries its 8,346 pounds of mass to 60 mph in a shockingly quick 6.5 seconds.