when you say tires are worn out....are they worn evenly? I have a 2012 28o QBS and the factory put the wrong axles on it (too small) and on first long trip burned up all the tires on the inside edge...
I can't believe Cruiser RV would claim no issues, I AM very happy that you were able to get new axles from Lippert. My warranty had to pay for the install.
The Shadow cruiser's were built with the smaller Lippert 3600 axles, Cruiser RV replaced mine with the Lippert 5200 ones at no charge they also replaced all my burned up tires due to the axle bow issue. on a side note...Lippert does not stock axle...