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I haven't yet up graded to an E4 but it has it's advantage in another area I experienced with a traditional WDH with sway control which will/can include the high dollar unit that was highly recommended. Basically by designed the size of the ball mount must be larger so sway control can be attached. This can cause turning issues when you need to turn as tight as possible when parking in tight situations at times. In my case I had room to spare before TV and TT would come in contact with each other but the ball mount tagged the frame of the TT and was the cause of a bent hitch bin that I questioned on this forum some time back. An E4 will not tag the frame rails of the trailer like a conventional unit and is a much more compact design with much greater advantages all around.
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