Colonus sylvanus (Sylvana Jumping Spider).
Photo: 05/27/18, 11 am.

Usually associated with trees, I found this little spider on my truck. Its previous name was Thiodina sylvana. Colonus sylvanus is common throughout the Southern and Eastern US. The month of May appears to be the prime time for finding this species. 
bug guide (this photo):
D. B. Richman and R. S. Vetter, J. Arachnol. 32, 418, 2004: