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I may get a flogging on here but I have a 12" 3580rl that dry weight is a little over 12k. I estimate around 15k loaded. Pulling it with an 07 Silverado classic 4wd crew cab standard bed srw duramax with 6 spd Allison. No problems and quite a few miles pulling under my belt. I bought this truck to pull a 33' grady white boat that was 12' wide and 14' high and weighted 18k when it was light on fuel. Truck did a great job with the boat and does a great job with the trailer. I am a very anal about maintaince truck has amsoil in everything since new changed at proper intervals. I check tires and hubs before every trip and while on the road very seldom do I run over 65 m.p.h. never get in a hurry and know where I'm going. truck has 150k on the clock and most people can,t believe its an 07 I hope this helps good luck.
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