I don't have an Expedition Timberline but recovery/cargo/storage can be universal. Some thoughts from the cheap seats... Hi-lift Jacks, if you have a rack you can mount it there, personal opinions and experience, jacks secured inside of the cargo area pose a greater risk to the driver and/or passengers should an accident ensue or a mount fails.
Mounts for a fire extinguisher are universal, you can build your own or order one, my personal favorite is a fast mount so you aren't sitting there untying it/removing straps should you need it. Seconds count in this situation.
Rear cargo trays are a cheap option, or depending how custom you want to go you can cut out/custom make a platform to your cargo area with drawers for recovery gear or tools. I have seen military folks tend to lean towards that option. Another option are cargo panels, tools and bags can be attached. If your recovery gear is lengthy you might want a full tool box that clicks together to differentiate.
Check if they have a storage system you'd like to invest in, I can't recall if you're specific model has one but I'm sure there has to be compatibilities somewhere.
First aid kits... can be attached to panels too. Depends on your vision... and hope this helps.