Southeastern Freight Lines
Columbia, SC
MC-111871 DoT 63419
Company Website
FMCSA Company Snapshot
Facebook - Southeastern Freight Lines
Profiled in Mike Terebecki's The Trucking Pioneers Book IX (click image to see Book index)
Patches of it that are in my project - Facebook Trucking Industry Insignia Patches
Other known patches
If you want your own trucking company memoribilia:
Items available on eBay
Note that patches sold by "freedomfifty2k" and "bob82ndabn325inf"are likely promo/replica patches, not patches actually used by the company represented.