thanks steve. i was considering taking one nail from each section. first, i decided i would try it with both nails. the slope is not very steep so i started in the high corner and i was able to get the fence to slope by connecting one fence to the other and using the weight of the fence to assist with the slope. i don't know if it would have worked with both nails if the slope was steeper.
thanks for the help. i am 2/3 done with the job now.