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Originally Posted by sagbags1
....snip..... Toyota told jane today to absolutely not put a wdh on a highlander.
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IMHO, Toyota dealer reps are protecting themselves, not you. That way, if you come back to 'Yota and show them what your WDH did to the vehicle by towing an overweight trailer, they're covered. Many folx have successfully towed a TM with a Pilot and with a Highlander whilst using a WDH.
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I hooked up the tm today and measured the front and back in the wheel wells. Their was about 3/4 inch difference from the front and back. It does tow great and breaks good.
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rtcassel (previous response)is correct. You must take reference height readings before dropping the tongue on the hitch. Try this eye opener. Secure some twine around the hitch receiver such that it falls to the ground. Cut the excess off, so that the end just touches ground. Tie another piece of twine in the center front of the vehicle; say the license plate. Cut the free end off at the ground also.
Drop the tongue on to the hitch ball. Retract the trailer jack until it clears the ground. Then measure the length of twine lying on the ground below the receiver. Also measure the gap between the string and ground below the other twine. Add the two measurements. That is the total imbalance of your towing setup w/o a WDH. Typically the rear will settle 2-4 inches, depending on tongue weight, and the front will rise 1-2 inches (ballpark for a non-truck framed vehicle).
A WDH, setup properly, will cause both the front and rear to settle about the same amount. Say the rear settle 2" and the front 1-1/2". The difference of 1/2" from the unloaded condition is a decent, stable configuration.
When folx here recommend a WDH, they're recommending it's use for the improvements in handling quality and, therefore, safety.
HTH - Denny_A