The top hole moves the instant center closer, and made my car more prone to wheelie.

When I first put them on, Calvert told me that you want to put the bars in whichever hole makes them more parallel with the ground.

For me, that was the bottom hole. Started out that way and had good success.

Tried putting them in the top hole for a while, but with the short 20" front segment in the Duster it always wanted to pull the wheels.