Morryde Rubber pin box

There are actually 4 ratings of the MORRyde pin box. Under 11.5K and over 18K are also sizes. The 4 sizes are primarily just different sizes (and maybe stiffness) of the rubber block inside. Going with too large a size wouldn’t dampen much chucking. Going with too small might allow the mechanism to bang up against its stops. Going from memory it moves about 3” back and forth and 1.5” side to side. We started with the under 11.5K for our small 9400 lb trailer. It has an 18K weight rating sticker on the metal even thought it came with the <11.5 block. It reduced chucking by about 50%, but it was a distinct improvement. Next we replaced the Lippert Equa-Flex cushioned leaf spring equalizer with the MORRyde SRE4000 rubberized equalizer. Night and day difference! Chucking was 99.9% gone—not reduced, but gone. As a side bonus, I’m sure the trailer itself was getting a much smoother ride. So, I don’t know how much chucking would be gone had we done the equalizer first, but the pin box is an inexpensive, simple, way to make an improvement. It also helps when hitching up—if not properly aligned as I back up, the pin can just shift to the side. When we moved up to a 12.7K trailer, I ordered the 11.5 to 14K block from MORRyde, and changed it out myself. It does take two strong folks to change out the box—the MORRyde has a lot of metal in it.