Had a 2006 Cardinal. It was well made, quality 5er. Owned it for 4 years until the boss found a Big County floor plan she liked better. Cardinal did not have a similar floor plan. That was the only reason why we no longer have the Cardinal. We never had one problem with the Cardinal.
We had it in the Texas summer and I used it for December deer hunting in IL. Ours only had a single AC but it worked fine in TX and the heater kept us warm in December. I would not have tried staying in it during the dead cold of winter even in IL. I would have been concerned about water lines freezing.
I'd have no concerns about buying another Cardinal.