I knew I had to shorten the rack, but to take 20" out of it like I did the truck wouldn't have looked right. So I played with proportions in PS and came up with a 10" reduction (5" from each end).
Here's the proof
I mounted it slightly aft of the OG rear mounting holes. Each "leg" has two bolts and I ended up putting the forward bolt of the rear legs in the rear-most OG hole. Then marked and drilled for the rest.
The front ends up forward of the OG front position and rear slightly aft of OG. Here it is: