I did a bit of digging on the axles, apparently, the Lippert 2K axles they were using had low Quality Control and were dropped in favor of Dexter axles.
But there having problems with the Timbrens as well. I will try and find our if they are using a cross bar. The Timbrens are designed to take a cross bar that connects each side. Some builders don't think it's nessassary. That is usually a mistake.