We have just bought a new A Class previously had a C Class When we went to put the tow bar on new vehicle realized it did not reach past the back of the RV Had to add an extension to get clearance. ...
As said, an extension will lower the tongue weight capacity, but not the towed weight capacity, as long as the extension is rated at least the same as the receiver hitch. Tongue weight of course, is not an issue when towing four-down. There are devices available to minimize any additional play the extension adds.
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