Sorry to hear about your issues.
We have a 2012 280 QBS. I love this camper. There really is nothing else on the market with the same size, weight, and price. Everything else was either too heavy, too small, or cost a minimum of 10K more.
We have had the exact opposite experience with the manufacturer. They have been so amazing that we decided we'd keep on purchasing their products due to good customer service.
We did have the axle issues which I agree, should NOT happen with a new camper (but hey, even the car companies have faulty/cheep equipment they try to let slide). They replaced those without batting an eye and we got new tires out of the deal too.
We also had a misunderstanding about our hot water heater. We thought is was electric/gas, and turned out only to be electric. We complained to our dealer and they notified the manufacturer. Cruiser RV installed a new hot water heater and paid for the labor as well.
It was actually the dealer that was giving us more trouble than the manufacturer.
Have you tried calling the manufacturer directly yourself or are you hearing through the dealer that the manufacturer won't cooperate? It's so odd that they are being so difficult that it makes me wonder if the dealer has something to do with it. I know that Cruise said they would pay for our hot water heater, but our dealer didn't want to pay for labor so they argued a bit and eventually it was resolved. But if your dealer didn't want to work with you they might spin it around that Cruise is being difficult. Just a thought, but I would call the manufacturer yourself and complain about poor service and see if they come through.
2017 Coachmen Catalina 323 BHDSCK
2018 Ford F150 FX4
3 growing kids and 1 big dog