I thought I would post a couple of pics of the rear suspension under my roadster. The car has been driven a lot. It has been absolutely the same for 35 years. It works great.The best part is there is no bind. I have seen too many rear suspensions that are in binds and things broken. Nothing has to bend to go over a bump. It gives equal traction. I have not had a posi since I started using this in the 60's. It gives anti-squat and anti-dive. The body always stays level. There is no body roll during acceleration. It is simple and easy to make. The bars are solid steel and the front bushing is in a 1 1/2" pipe with Chevy II bushings. It features a torque arm on the right and a locating bar on the left. I also have a low mounted panhard bar. It works by the ladder bar pushing up on the right side. This increases the load and traction on the right side rear tire. It also pushes up on the right side of the body to counter the body twisting over from the engine torque. The upward push counteracts the rear sink due to acceleration.The geometry makes everything balance out.
That is a good system with pure simplicity. I've also seen that on the front with a "Hairpin bone" on one side and a link on the other. Speedway dirt cars in the 70's did exactly what you did with only a R/H ladder bar [parallel] They tried harnessing Torque reaction to plant the RR tyre only. They normally weight jacked a soft RR and ran stagger
Got the same thing under the Whatever Project. First saw this on the Bobby Unser Pikes Peak 9-time winning sprint car. They built it in 58 or 59. Figure if it was good enough for the Unser clan, it was good enough for me…