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I may be wrong, but I don't think you can just add a second axle in front of the current one. I think you will have to move the current axle back when you add the second axle to maintain load stability.


A boat trailer is probably an exception. Most I've seen have the axle(s) much further back than what it would be for a car hauler. Adding the 2nd axle in front on a single axle boat trailer looks like it'd about right as a tandem for a car.

--Dan