lenr wrote:
The MORRyde pin box doesn't raise the height and is adjustable up and down in the frame just like the stock pin box. You have to purchase the MORRyde pin box compatable with the OEM PIN box so all the bolt sizes match and the holes line up. MORRyde lists comparable OEM pin boxes on line. The MORRyde SRE4000 rubberized equalizer does raise the trailer 1.25" but most of us can use the help back there to level the trailer.
The 1621 designation is the pin box bolt pattern. The box comes in long or short and the two weight classes. I changed from the SRE3000 to the SRE4000 and saw no differance in height.