I see the confusion.....I do not run a triangulated 4-bar configuration.
I run the bars in a standard 4-bar / 4 link configuration ......in line with one another. The parallel refers to the plane of the bars....both upper and lower bars run parallel to one another....no instant center. (imaginary point where the upper and lower bars would intersect)
triangulated (in triangulated 4-bar) refers to the top bars (only) .....one from each side that basically make a triangle IF you added a imaginary line between the frame mounting points......the only function of this configuration is to keep the rear centered without utilizing a panard bar, watts link, or diagonal bar ...or some other centering device.....NOT maximum traction.
the configuration of the bars on a drag racing set up IS for maximum traction.....NOT to locate the rear.