Typically you need the flat top knuckles on a leaf spring truck to run. High steer too clear the leaf springs. See waggys have spring under the axle setups from factory. Everyone does a spring over on them for lift and ride. When you do spring over you need flat top knuckles and high steer arms to clear.
As for the Toyota box you don't have to use one but you need a box that mounts outside the frame and that's the most common one because they are strong.
Old ford broncos will work and a few others. Some people wedge jeep boxes inside the frame but clearances are really tight in there.
2003 Ford Ranger Lincoln Powered 5.4L DOHC, 42s, COs, D60s, 203/205, 4points, caged, full hydro, 3link front and 4 link rear.
1998 f150 bone stock baby hauler...