Enthusiast II
You can’t go wrong with an F350 Tremor 7.3L! Love mineI'd start with deciding what you did, and didn't like about the Silverado. I run a full size Silverado too and love it, but we all think about what they'd do differently next time. I can't imagine a more complete and comfortable overlanding rig with more range and capability (for the comfort it provides). That said, I love to day-dream about other setups, and will do a more minimalist/hardcore trail setup with my WJ. So that's where I'd start: how do you want to continue doing Overland travel and what did your Silverado do well, or poorly.
If I was starting from scratch I'd prob bet getting a new F350 Tremor with the 7.3L gas. Why a Ford not another Chevy? Well I solid axle swapped my Chevy, which was a lot of expense, time and work - with a Ford (or RAM) I could have just started solid/solid. Why the gasser? I don't love the emissions systems and added complexity of the newer diesels. One thing I'm not sure about is whether I'd do a regular cab 8' bed to be able to do the larger Grandby FWC, a Crew Cab 6.5' bed and Hawk like I have now, or Crew and 8'. I don't really feel like I need more space inside the FWC in terms of "living" since I try not to be inside of it other than sleeping, cooking or getting out of the rain. But I do feel like a bit more storage would be great. The Crew + 8' would give me the most storage, but I don't really want any longer of a rig.
Anyway, my point in mentioning ^this^ is just start thinking about what (if anything) you'd like to do different this time, and that will guide your towards the right rig... since you mentioned "Pre-Built" I vote Prospector XL for you with a FWC in the back. ;)
-TJ