Well I guess I'm wrong, I assumed E rated would be a 10 ply.
These guys are wrong too then.
http://www.bbwheelsonline.com/bfg-allterrain-t-a-ko-tire-lt275-70r18-10-ply-e-series/Summit lists them as a 3 ply sidewall, I see nothing on BFG specs that says either way.