After making some changes on my Roadtrek 190 on a 2007 Chevy Express 3500, I have the following surplus parts. All prices are plus shipping; I’ll use PirateShip to get a reasonable rate. Not sure how to post pictures here but I can email or text them to you.
1. Roadmaster active suspension. Details here
https://activesuspension.com/product...-van-1986-2021. Removed when I changed over to air bags. Im guessing this was on the vehicle for 10 years or so they are a bit rusted but fully functional. These fit under the leaf spring top U-bolt plates, so plan on replacing your existing U-bolts as part of the install. $100.
2. Sumo CSS-1168 coil spring inserts. Details here
https://www.superspringsinternationa...shop/css-1168/. Installed and driven maybe 20 miles before I decided to go with aluminum coil spring spacers. These are easy to install! $100.