I was able to find a brand new scratch/dent Dometic 2551 for almost the same price as just the cooling unit. Picked it up in Elkhart this weekend along with the roll of Filon. The original was the Dometic 2554 is 3-way, the 2551 is only 2-way. We only have room on the roof for 100w of solar, which is about 5 a/h, the fridge draws 15 a/h running on 12v, so if we stop for lunch and turn the truck off, I'd need to switch the fridge to gas anyways to keep the battery from going dead.
Will be pulling the slide this week, stay tuned,