@volomte,
@gooch20.ks
The idea of a dually Ranger comes up about once a year on the forum here:
Full size axle/adapters work with current rims and tires, but
The issue with a Dana 70/Sterling10.5 i.e. full size dually axle - they are very wide: Outside tire outer edge is at ~95", while stock Ranger is ~68" And they are heavy - Sterling is 330lbs versus 130lbs for Ford 7.5" and that doesn't account for extra tire & rim mass - which can easily be another couple hundred lbs compared to your current set up.
The issue with adapters: Your current semi floating axle shaft extends 2-3/8" past end of axle tube, the outer bearing is more/less at end of axle tube. If you use adapters, you will need to space the inner rim out at least 4" (or the inner tire rubs on the spring). Think holding 20lb dumbbell straight out at elbow versus holding 40lb one straight out from shoulder - not good for the axle.
The issue with the Toyota - the rims are small and narrow - 14 x 5j; the backspacing was for 185R14 (aka 185/80R14) tires. Anything larger than 195/75R14* and the tire sidewalls start rubbing against each other, and that is setup for blow out of both tires.
* Assumes you haven't spaced the rims apart.
We need someone like JC Whitney to make rims in current size/bolt pattern/to fit current brakes and then we can work on the axle issue.