Rml8555 ref will not run on gas

do you have a fuse in the plug? if so it is probably tripped and needs replacing.

Have you checked the belts and hoses, and make sure you top off all fluids before any road trip.

The odometer/trip display in this model is a LCD display and it is burned out, it is a common fault on all GM models in this model year range. The problem can be repaired but it requires the Instrument cluster be removed form the Van and be sent out to a GM approved repair center. These repair shops are on the Internet just google GM instrument cluster repair. The cost is about $160.00 US.
The gas gauge is a separate problem, it is caused by a defective gas level sending unit inside the gas tank. TO replace the level sensor for the gauge you must remove the gas tank from the van. To do this repair you need a good hydraulic floor jack, jack stands to support the car and a good set of common hand tools and a helper if you do the job on the ground. Use great caution when working on a gas tank as the risk if fire and explosion is quite high if proper care is not taken to a avoid creating sparks. Always dicinnect the battery negative cable before starting work on any part of the car. The parts cost for this is about $200 and 4-5 hours of hard labor.

Try looking at the fuses in the fuse box some of them might be blown and if they are then you probly have short somewhere in your car (replaceing the blown fuses might help)

You could have a bad regulator.

the odometer is bad, if the speedo works ok.. you will need to send it off and have it replaced. most auto shops/dealers have a place that they send them off to .

I would think that the wires from the RCW (rock climbing wall) that control the running lights are wired to the interior dash lights of the van, and a fuse blew, killing the above mentioned lights. Check the fuse block for a bad fuse, probably labeled inst lights or inst lgt. Did you make the trip there in daylight, and trip home at night? The fuse for the dash lights couldn't handle the extra drain of the RCW running lights.

You could have gotten bad gas in your tank. Did you try dry gas at all? Also, bad gas can leave alot of sediment at the bottom of your tank, waiting for the right movement to get moving into your system. A new filter would only get quickly clogged again. I had this happen- got gas from a station after a flood- fuel tank had to be dropped and cleaned out.

Your voltage supply is being interrupted. The DC voltage needs to be at least 10.5 to work properly. If you are switching from shore to gen this can cause the interuption also. I presume the gas supply is staying on when you are traveling.