I have towed my 3124KS about 25000 miles and I will have to agree with jkeck555 100%. I have a 1999 4-runner with a tow limit of 5000 lbs. I regularly go up and down 1-70 from Denver and hit the 7% grades often. I have found that the weakest part of my 4-runner on those steep grades are the brakes. Although the rotors have fins in the center, they are thin and will warp easily. I have gone through 3 pair of warped rotors and finally resorted to using engine and trailer braking as much as possible.
The 4-runner operates great on grades less than 5% but will have problems with more than 5% grades. But like a lot of people with limited finances, it will have to do for now.
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