Best Suspension Upgrade For 2018 Keystone Raptor 428SP

Updated 11/25/2025 | Published 04/09/2025

Products Featured in This Question

MORryde Suspension Upgrade Kit for Tandem Axle Trailers - 2-1/4" Long Shackle Straps

(1924)

$125.09

MORryde Suspension Upgrade Kit for Tandem Axle Trailers - 3-1/8" Long Shackle Straps

(1924)

$116.16

Question:

What is the best suspension upgrade for a 2018 Keystone Raptor 428SP? Slowly our aging suspension has failed us and looking for an upgrade and not just a replacement.

asked by: Ryan H

Expert Reply:

Hello Ryan, thanks for reaching out. The first thing I recommend doing is replacing your suspension bolts and shackles with one of the MORryde Suspension Upgrade Kits. These come with HD shackles, wet bolts and bronze bushings. I will just need you to measure your current shackles so we can make sure the new ones are the same size. They come in either a 2-1/4" long # MR46ZR or 3-1/8" long # MR76ZR. Shackles are measured center hole to center hole.

You may also be able to upgrade your equalizer. I will need to know the hole to hole length and height of your current equalizer. I included a picture below that shows how to measure a standard equalizer. I would just need the dimensions in red and blue. The bushing/bolt size is always 9/16". There may be a part number on your equalizer which we may be able to cross reference.

You may also want to replace your leaf springs. I would need to know your axle weight capacity, plus the unloaded eye to eye length of your current spring. Leaf springs are measured unloaded from center eye to center eye.

Basically all of these suspension parts need to be identical in size to the stock parts. Sadly, there is no way to look up your camper to know these kind of specifics. RV manufacturers just do not list this kind of information online.

For now, let me know your shackle size, equalizer size, leaf spring length and axle weight capacity. I am happy to get back to you with a list of recommendations. We can also go over other suspension upgrades like a shock kit if you wish.

expert reply by: Jesse M

Jesse M.

10/22/2025

Hey Ryan, were you able to get the measurements for your shackles, equalizer, and leaf springs on your Raptor? Once you have those details, I can help narrow down the best suspension upgrade options. Let me know what you find—I’m here if you need a hand sorting through them.

Ryan H.

11/24/2025

@JesseM sorry for the delayed response. These are the equalizers we currently have https://www.lippert.com/catalog/product/view/id/2462/s/equa-flex-rubberized-equalizer-triple-axle-kit-heavy-duty-5000-to-8000-lbs-279689/category/523/ They dont have a model number on them but they look like the exact ones we have and I couldn’t find others ones that also look like these. The shackles are for sure 2.25. I think our leaf springs are good for now so let’s look at the equalizers and a heavy duty shackle kit. I’m leaning towards Morryde but I know Lippert has an option as well for those. Thank you for your help!!

Jesse M.

11/24/2025

@RyanH Great thank you for that info! The MORryde equalizer and shackle kit are definitely what I recommend. You will need the following: - MORryde Rubber Equalizers for Triple Axle Trailers - 35" Wheelbase - 8K # MR39ZR - MORryde Suspension Upgrade Kit for Triple Axle Trailers - 2-1/4" Long Shackle Straps # MR86ZR

Ryan H.

11/24/2025

@JesseM thank you so much for that information! Another question I have is if I want to reinforce our hanging leaf spring brackets , would the Morryde X factor crossmember be a good choice? If so which one fits outs?

See All (4) Replies to Jesse M. ∨

Ryan H.

11/25/2025

Can you just install one of the crossmembers? Our rear brackets have failed us multiple times and I want to reinforce them.

Jesse M.

11/25/2025

@RyanH I really can't recommend doing just one for a triple axle setup. At the very least you will want to do two - one on the front and one on the rear. Need to keep things even. Doing all four is still recommended for maximum support.

Ryan H.

11/25/2025

@JesseM which one would work for our rig?)

Jesse M.

11/25/2025

@RyanH You will need the MORryde X-Factor Crossmember for Standard Frame Hangers # MR33WR. Just make sure there are no lines or wires or anything behind the hanger that would obstruct the crossmember. Some applications require the drop down kit # MR43WR.