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Not making a statement about SRW vs DRW, but saying that 20" wheels are not going to help with loads. The use of 20" wheels can restrict the use of a truck to good paved roads, due to the low profile tires used on them. With the fine roads we travel on, wheels will get bent and tires damaged with all the defects in the pavement. The following is from our Chevy manual:
20 Inch Tires
If the vehicle has 20 inch P275/55R20 size tires, they are classified as touring tires and are designed for on road use. The low profile, wide tread design is not recommended for “off road” driving or commercial uses such as snow plowing.
Notice: Low profile tires are more susceptible to damage road hazards or curb impact than standard profile tires. Tire and/or wheel assembly damage can occur when coming into contact with road hazards like, potholes, or sharp edged objects, or when sliding into a curb. The warranty does not cover this type of damage. Keep tires set to the correct inflation pressure and, when possible, avoid contact with
curbs, potholes, and other road hazards.
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