I've been into the Fred Meyer's on the south end of town many many times and have never seen a dump station there. I would doubt it as their parking lot is rather tight. I've never seen a TT or MH in there.
I can't speak about the FM on the north side of town, but I doubt it. I say this because none of the Fred's down here in Anchorage have dump stations.
Bill
Nodwell RN110 out moose hunting. 4-53 Detroit, Clark 5 spd, 40" wide tracks, 10:00x20 tires, 16,000# capacity, 22,000# weight. You know the mud is getting deep when it's coming in the doors.