I can offer a little before and after comparison with my 03 SR5 w/17" wheel package towing a 3650lb 26' Aerolite TT before and after the WDH was installed. I reluctantly pulled it home with a standard receiver after I bought it and was surprised that it didnt feel as bad as I thought it might in terms of bounce and sway. 55 mph produced some oscillations on the freeway but manageable.
I still felt that a trailer this size over the highway on a windy day should have a WDH so I bought and installed unit myself (though camping world happily torqued all the bolts and ball for me). It made a noticeable difference in how stable the whole rig felt that I think it was worth doing. Even around town. Far less bouce and a "lighter" feel to the trailer.
I do also have a 19' boat that only weighs about 2500' that does not have, nor require in my opinion, this WDH setup.
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