I'm not into trucks very much but those SS versions are really sharp! That price is 'very fair and reasonable' for a stock SS with those ultra low miles. It certainly is worth checking into (number of owners, clean title, good Carfax, etc..) and I'm sure there is some wiggle room in the price as well. That would be a sweet truck! I would jump on that if in the market.
2001 Trans Am Convertible Red w/ taupe top (A4)
2007 Ford Mustang GT/CS Convertible White w/ black top (5 speed)
1974 AMC Matador X Red (3 speed auto)