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Sitting that long is not good for a fridge. Take a look on the inside of the fridge and give me the model number off the data tag. If you don't see it there, look on the rear after you open up the outside inspection cover down in the lower left hand corner. Is the manual you have the Owner's Manual of a Service Manual?
This is a manual model and only requires 12 VDC for the ignitor on LP mode. It will work on AC mode without any DC power. You do have to be plugged into 120 VAC with the shore cord first. You can take a 12 VDC test light or small digital multimeter and see if you have 12 VDC to the rea/r of the fridge where the power leads come in from the trailer and if so, you should get a spark when you turn the selector switch to "GAS" and push the gas valve button. Sitting that long may have affected the LP regulator at the tanks so you might want to have that checked or just replace it with a good Marshall regulator. About $40 or so. If the fridge comes on and the coils begin to get hot, but no cooling is noticed there may be an issue with the cooling unit and we can test that. Give it about 4-6 hours on first. Get back to me with the results and we can go from there. All follow ups are included in our fee. I will make a phone chat offer for you as well.