I'm not old, honest...
Single triangulated is most common for us weekend warriors but not the best offroad. When we were in Sand Hollow I tried a deep V notch. My rear axle did not stay centered allowing one side to drop into the notch. In other places it did the same. This is called understeer. Add to that my shocks were low on oil so it appeared to push around even more.Fancy. More on that 4 link though...............what's the deal? What's Rich suggesting you do?
Rich tells me the only solution is double triangulated.
I can move my frame mounts in about 2.75” on each side without much work. If I go full blown double triangulated it will require a new crossmember and other work. Currently I’m waiting for @JohnnyJ to stop by for some wisdom.