Re: Change Axle?
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Yes. Would be nice to see pictures of current axle and current wheel position (also showing fender position / clearance measurements).
Some axle tubes are round with molded ends. Some axle tubes are square with molded ends. And, some are bar design with spindles inserted in each axle tube end. Many different axle designs in use today...
Suggest pulling your trailer (with boat on it) to a few welding shops and allow them an in-depth visual. They will recommend changing existing axle and if less costly, perhaps replacing with new axle (with shorter hub face axle). With the trailer in their sights, they can also perform visual checks on fender spacing. And if needed, re-position the fenders as well. Each axle (trailer with boat) is unique...
Hope this helps..