It's a bunch of work for something that looks cool to the unwashed masses, but looks gay to the people that know it's bullshit.
Get a real dually axle under it, like from a Toyota-based camper. Be aware, though, that the first Toyota-based campers were bought as chassis-cabs by RV converters with single wheel axles. The converters put wheel adapters on them to make them into duallies and sold them with the camper bodies on them. The little single wheel, semi-floater pickup axles started failing. Toyota, still new in the US market, decided they didn't want that publicity and they offered to refit anyone with a crappy wheel-adapter dually with a real full-floating, dually axle. They also stopped selling the single--wheel chassis to RV converters. You see three types of Toyota-based mini Class Cs now. Some have regular wheels on the front and Budd-type wheels on the back with real dually axles. Those are the ones that Toyota replaced. You see ones with Budds on the front and rear--those are the newer chassis-cabs. You see a few with adapters on the rear still and single-wheel fronts. Those weren't used much.
I would love to have a dually Ranger, but not a piece of trash one. A Ranger has a 2,750# axle. Using wheel adapters on it reduces that capacity because you are loading the wheel outside of the wheel bearing which gives any weight on the axle a lever to abuse the bearing with. It might look cool, but it's rubbish.
That guy (hardly a member with only one post made a year and a half ago) could have had a real dually axle cut down for the money spent on those wheels. The fronts don't matter. You don't need a one-ton front because the weight is carried by the back axle. I don't mind the IFS front on that truck. The frame on a Ranger is strong enough, too. The pathetic axle is my beef.
I have plans to do this, but I will use a 1-ton SRW axle. I have a 14-bolt, which is a 7,500# capacity axle, and will run wide singles with negative offset. I will pull an 8,000# gooseneck with it, and I don't think you want 2,000# of tongue weight on that Ranger axle with positive offset adapters.