Looking forward to seeing your build. I’ve been working towards a 3-link rear, for the same ride problems, and shocks/springs are a question. Logging trucks have an air-ride seat, so they do have a much more comfortable ride than my cart !
I have a Jakes LT on an EZGO, and the stance is about 4” wider in the front. After a couple years, it is very squeaky, no lube has helped, so I’m planning on replace the heim joints with grease-able ones, and maybe narrowing it then too. The shocks it came with are done. Most travel is rough dirt roads for us.
Best -
