Thank you for the links.
I have found this from LA County lifeguard.
I think I'm going with this or an LA City/County utility truck with similar setup.
I have looked all over for Swift water rescue form the 1990s and theirs not many if any photos best I could do is them speaking on how they set it up and the vehicle type they used but no photos or them showing the vehicle sorry man I even checked some off their truck records
https://www.lafire.com/fire_apparatus/LAFD_ApparatusRecords.htm