Originally Posted by montague
Does anyone know where I might find an owners manual or schematics ?
No, sorry. Your RV is 24 years old. Holiday Rambler and most other RV manufacturers provide service such as replacing Owner's Guides and wiring diagrams and plumbing schematics for only a few years - 7 years in the case of Holiday Rambler.
Holiday Rambler - ownersmanualshr
But tracing gas lines should not require anything more than paying attention, and perhaps removing some panels or the covering of the bottom of the trailer box.
If your goal is simply to be able to use propane for the water heater and/or furnace, then cap the gas line where it used to screw into the reefer. The gas lines are plain ole black pipe, and the threads are plain ole tapered "pipe" threads (NPT) . Or if you want to get rid of the gas line near the reefer, then trace it back to a connection or wye or manifold and unscrew it, then screw in a short nipple with a cap on it. The gas lines are probably either 1/2" or 3/4" black pipe, so LPT nipples and caps are available at any decent hardware store.