Try tractor supply
Go to Curtis Tire on Great Mills rd, he does about 6-8 trailer tires per year for me,,
I've had so much trouble finding the D and E rated trailer tires around here that I just order them on line from these guys any more:
Trailer Parts Superstore - Shopping Index
Big Ed's
Big Ed's is the tire place on 5, JUST north of Fairgrounds Road.Uh.... a little more info, please? Not familiar with them.