i am building a small system in mid michigan 42 panels total my plan is two rows 21 panels a row 4x4x8's in the ground 4 foot front row and 4x4x12's for the rear legs 60 degrees tilt facing south i have the two rows marked 12' apart its there a good was to figure out if i am going to have any shading issues? i was told 12 foot it too far but i think its going to be too close , the plan is to have the front about 4' off the ground and the rear will be what ever 60 degrees ends up at. i am running 1"pipe horizontal with uni strut vertical to bolt the panels to and laying the panels down so the wall will be 3 high totaling ten foot tall . my brain got erased so i am a bit handicap in the thinking area thanks for your time!