I live in Jefferson County TN (East TN). As stated there is a basic state registration fee and each county adds additional fees. I pay $75 per vehicle including the motorhome.
Each county has their own property tax assessment along with building permit costs. I just built a new house and it was based on living space completed, once complete they assess the property as to level of finish. IMHO the tax assessment on my new house that I built is lower then what I would have bought an equivalent house for.
I just completed a 40X50'X16' garage, the building permit was $400, it was based on square feet. I have not been assessed for the property tax yet.
If you are a DYI'er TN you can be your own general contractor building your own house and can also do the electrical and plumbing, which is what I did. You can save $$$ but it is a commitment, one that I'd never do again.
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi