I have used a Robin WDH (a round bar hitch) for the last 7 years with our 2720SL, and have had no interference issues. I have heard rumblings of these problems, but I have never figured out what exactly the problem was.
Dave
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2000 2720SL & 2007 3124KB
2005 Toyota Sequoia
Twin Battle Born 12v 100Ah LiFePO4 (BBGC2) batteries, 300W solar on rear shell, Link 10, Lift kit, Maxxis 8008 225 75/R15 E tires
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