Nice to see a big truck getting built. I miss my old Super Duty. So much room in a full size rig, and if you put a good suspension, tires, and lockers, they will go most anywhere they will fit. Well, except for places their weight will work against them. I ran dual ARB air lockers and 35s and off road travel was never a problem, except for once I broke through the ice everyone else drove over.
Here is my old beast, RIP.
I'm sure your OME springs will ride much better that stock, even my Pro Comp springs were (slightly) better.