My TM does visibly weigh down the back end of my Tahoe. It is probably because the levelling suspension no longer functions. Unloaded, the Tahoe rides level and well.
I towed this TM from Tacoma WA to Vancouver BC. With the exception of poor electrical connections between the TV and TM causing inoperative trailer brakes at times, it did tow well. By the time I load it up for camping, that could easily be adding 500 lbs (includes 2 kids). I consider the a WDH a matter of safety. It will restore weight onto the front wheels. The effects of this might not be noticeable in normal driving, but might be important in an emergency maneuver.
I'd agree that sway control is much less important with my Tahoe and TM, but I'm not too comfortable without a WDH.
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