My TT is 23 years old. All the appliances are original and work well. ( I did change out the power converter but, that is because I wanted a new style the old one was still working )
I've only owned it for about 5 years so I have no idea what sort of roads it went down.
I did put now foam rubber in the seats and the curtains need to be replaced
badly.
For some reason it seems the springs are getting soft and the TT is getting closer to the ground. But, because I don't travel off road it does not bother me. They could be replaced if needed.
The biggest problem is that it is starting to look a little tough. I live on a gravel road and the stone bruises on the front of it are getting more numerous. Plus, there is a few scratches here and there and the paint is getting faded.
I hope to get a few more years out of it. Cross your fingers for me.