35x12.5s are actually easier on an 8" wheel than a 33x12.5 the tread has less leverage/angle to the beat seat....
i would definately run a 35x12.5 on an 8"
i mounted 33x12.5s on stock 15x6 toyota rims on a shortbox first gen truck, and was able to see the customer come back several times, he never had any issues with irregular tread wear