Found this recently, Never seen it before so here you go. 
 

this script is so much more than just a stretcher script please read this post and the GitHub in its entirety before using this script.

**  Currently running on over 105 FiveM Servers, ESX, FX base, vRP, and EsVrp, no Lag, better performance than the free legacy version. And more cool features!!!**

Features of FiveEMS Premium

• F7 Menu +white list menu
• /deltent command
• Auto Whitelist esx ambulance job
• improve player sync
• fix bugs where the menu opens while in the vehicle.
• Spawn and Remove Tent props
• can load A.I ped onto compatible stretchers
• Helicopter Support
• no time warnings uses HTML ui menu
• optimized script
• works on ESX and Non ESX Server
• works on multiple stretchers
• works with other developers ambulances
• contact our team to make this script comptatible with your ambulance you
  will need zmodeler to make your vehicles compatible with this mod.

What is this?

FiveEMS allows the player to place Ped or Player on any compatible stretcher and load them into a compatible vehicle for transport. Also has a EMS Whitelisted menu allowing the EMS professional to spawn multiple props and to switch between compatible stretchers. While in enroute to the hospital the player can go into cardiac arrest and the players can simulate CPR with Lucas Device [ only with equipped stretcher], start IVs and monitor patient on the cardiac monitor. There are more 4 compatible stretchers and compatible vehicles are in the works. It add realism’s to your roleplay. Included are props replacements that work with dpemotes to allow the player to carry medical bags and equipment to the scene of the medical emergency.