cost of Morryde suspension.

Cannot give you a install price (DYI is best if you can), but while at it, add wet bolt kit at same time. Factory hangers are cheap BTW as far as quality goes IMO.

Just changed the factory equipment to an Equa-Flex but it is basically the same job no matter what you are putting in. Worst part of the job was jacking the unit up and getting it on jackstands. After that it was unbolt and bolt in new. If you get the wet bolts go for the bronze bushings too. 2182 miles on the original plastic bushings and they were about 25% worn through. Last trailer had about 6000 miles on it when I changed over and the plastic was completely worn through. It is a job worth doing.

Be sure to get the HD shackles with wet bolts when upgrading the equalizers, and the MorRyde xfactor brace will add side support to the spring hangers.

If you get the Dexter E-Z Flex Suspension Kit, it comes with the wet bolts

The equalizers themselves are under $150. I can't imagine a shop charging more than $500. It should only take them an hour. Very simple item to install.

Ours came with the Cre-3000 and wet bolts. Still the trailer had a bounce to it on less than perfect t roads. I found a nice difference installing the Roadmaster shock kit. I did the install myself but I can't imaging the labor being more than $1000. It only took 4 hours to install. It might be worth asking what they would charge for this while the trailer is in the shop anyway.

https://www.etrailer.com/Trailer-Leaf-Spring-Suspension/Roadmaster/RM-2460.html

Highly recommend MorRyde SRE4000! It is as easy an installation as any equalizer. It does raise the trailer 1.25" at the axle so road bumps can move the axle more and the trailer less. Lippert Equa-Flex never seemed to make a difference for us compared to a solid equalizer. Adding MorRyde pin box helped 50%. Switching to the SRE4000 eliminated 98% of chucking which tells me that the trailer is getting a much smoother ride. If adding wet bolts I recommend heavy shackles at the same time--both Dexter and MorRyde make the heavy wet kits.

A little more: Our first experience above was with a 27' fifth wheel 9400 lb loaded. Because the SRE4000 made so much difference, we had it installed on our new 37' fifth wheel along with the wet heavy kit straight from the dealer. MorRyde strongly recommends their X-Factor brace when using the SRE4000. We ordered the SRE4000 and 3 X-Factors on line at considerable savings then had them installed at an independent Dexter shop. They used a Dexter wet bolt heavy shackle link kit. I put a shot of grease into each bolt about every 6000 miles, and expect to never need replacement parts. We had the work on the first trailer done right at MorRyde. Their service is very good but not cheap. We used them because we also needed 2" riser tubes added to level the trailer.

We had the Morryde SRE4000 installed at the Open Range rally in 2018 along with wet bolts and 1- X Factor crossbar. I think I paid $1500. It was installed by Performance Trailer Braking. They usually have a rally discount.
JK
Edit: Looked it up, $1040 total.