I thought you might like to see how I used the 11/2U rack. I put a male flanged plug on the right side to the back and a black hardwired 4 way receptacle on the left side. By removing the plate in from a got a 4U in front.
Mixer- Soundcraft MFXi12
DBX Stereo EQ (5lbs)
Crown xls 1500 Amp (8lbs)
Technical pro power station (3lbs)
USA case with lids (15 lbs) Only (12lbs W/O Lids.
I used to 3’ neutrik speaker cords that stay connected to the Amp. I put Neutrik Couplers on the ends so they fit inside for easy tear down. Check out monoprice.com in the Audio pro cable at the bottom of the page.