How To Choose Correct Replacement Leaf Springs for a Grand Design Solitude 378MBS

Question:

Im looking to upgrade the suspension on my 5th-wheel trailer. The suspension is currently rated for 7K per axle 2 axles and Id like to upgrade the leaf springs and related parts to 8K per axle. Its a 2021 Grand Design Solitude 378MBS. I tried contacting Grand Design but they werent willing to provide me with compatible part numbers.

asked by: Anthony P

Expert Reply:

In order to find the correct replacement leaf springs for a trailer you first need to start by noting the type whether that be slipper or double eye. Then, you'll need to measure their unloaded length via jacking up the trailer. If the springs are worn they will measure longer than their replacement. Lastly, you will need to note the axle capacity which is found on the tag in the center of the beam. Please note, the number of leaves does not really denote capacity as leaves have different thicknesses. Once you have all this info you can choose the correct replacement from the list below. The springs should be replaced in pairs as well. The 7-Leaf Double-Eye Spring for 8,000-lb Trailer Axles part # DX74XR is a pretty common replacement measuring 24-7/8".

Unfortunately, we have no way to look up leaf springs for any one particular trailer.

expert reply by: Conner L