Did you just purchase the motorhome, or are you moving to South Carolina? The tax is based on valuation of the motorhome (set by taxing authority), multiplied by the tax rate. The exact tax rate varies by county/city. I was told when I bought my previous motorhome that they maintain the valuation for the first three years and then begin to depreciate in the fourth year. You can save some money if you can claim the motorhome as a primary, or secondary home (6% of valuation vs. 10.5% of valuation for a "vehicle"). You can also transfer tags from a previous RV, if done within 30 days of purchase of a new one (new to you). As far as amount, it is really hard to say. On the coach I traded last year (2003 American Eagle 42') I paid a little over $800 with it categorized as a second home. I live in Greenville county. I transferred tags to my new 2011, and the taxes continued from the previous one (just paid them).
2011 American Eagle 45B