New frame new shocks and springs?

Gents, I'm currently loving my new-to-me 03 xtracab with a 6 month old frame. If my searching and lurking proves correct that means that the taco therefore has new leafs, springs and shocks. Visually however the rear shocks (blue and yellow. Bilstein 4600 or TRD?) look pretty beat up and my leafs, which should be new are sitting pretty flat. Ride quality is currently pretty firm if not almost bottom'd out sounding. I love the firm suspension feel and small amounts of body roll so my question is can someone confirm that Toyo wouldn't have replaced the rear shocks if they were aftermarket? If my springs are newish would now be a good time to update shocks? What would you suggest to someone that isn't probably going to lift but wants to fit 31s and 32s and doesn't like body roll?