Electric Brakes.. Wheel/Drum move back and forth

Thanks guys! That makes me feel more confident that my installation was correct. Randu, as far as the spacers go do you think that several simple washers would work or should I fabricate something larger and thicker? I still wonder if anyone else has run into this issue or is my unit unique.

Since I purchased this camper twelve years ago I have learned a real valuable lesson...that it is better to spend your budget on an older quality built camper than a newer poorly made one!