Having worked on PowerHop for the 2nd gen CTSV and and creating a couple patents for the solution, this is the only torque arm I have seen that correctly addresses the reaction loads for both acceleration and braking for torque arm rear suspensions.
https://www.unbalancedengineering.com/Camaro/TA/
It did not make it into production, but also developed a torque arm for independent rear suspension vehicles as well - combined with asymmetric 1/2 shafts eliminated all PowerHop under all conditions (high / low mu).
https://pdfpiw.uspto.gov/.piw?PageNu...%3DIN%2Fmikels
https://pdfpiw.uspto.gov/.piw?PageNu...%3DIN%2Fmikels
Dave