I don't think you need a diesel if you're only going to tow a few times a year but the 2500 has bigger brakes, E load tires, and suspension better equipped for hauling big trailers. I've probably put 100K miles on my trailer and even with a 2500 it can get sketchy when there's a fair amount of wind. Unless GM has improved the brakes drastically on the 1500's they suck and can barely stop the truck in a panic situation.
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