Some 1575 owners are upgrading their axle to 5,200 lbs

My 1575 has a sticker on the door that says I have 460 pounds of cargo capacity. There is another sticker outside on the left front that makes it clear that there is an additional 240 pounds of cargo carrying capacity if you leave the fresh water tank empty for a total of 700 pounds. I haven't weighed the trailer but have weighed the added cargo and it totals less than 450 pounds so I leave the water tank empty and feel confident I am under the 700 pound limit.