I would check with your state consumer affairs div and find out if the Lemon Law applies to RV's there. In some states it does and others not. If it does it gives you more leverage. While I personally would rather keep my RV at home while they got the parts that might not be the best course of action for you. They could claim it was only out of service for the actual number of days they had it on their lot and that it was usable the rest of the time. It also clears their lot for other units and puts your repair at the end of the line, not that it seems they care.
I do understand your frustration but the problem sounds like it is the repair center more than the unit. I would start pushing to have it moved to a different repair facility the one its going to now is obviously incompetent. And keep pushing for a new unit but dont expect it to be trouble free.
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