We haven't yet purchased our TT but will be in the next few years , right now it's all about the research . There seems to be lots of discussions regarding folks changing out tires and/or axles and/or...
It's like everything else, some people actually put some effort into buying a RV and some are mesmerized by the fluff. My trailer is approaching 12 years old and I had to fix a few items but it has the same axles, wheels, springs etc.