Turning a fixed tandem axle to a spread axle

You seen them close up pics last week on FB of them spread axle vans some fella (I want to say in pa) was selling? I think I seen you tagged in that post.
One unit looked like somebody cut the slider in half, slid the axles to where they wanted them fixed and welded in place....
that doesn't seem to me to be a good way to do it, based on how stout the setup is on my spread axle.

 

How's the slider box work?

You talk to @Largecar359 about it? His came out beautiful

 

I bought his old one. His new one is the tits.
Mine

His

 

Both 50x102

 

More trouble than it’s worth...

 

I don't barely use it at all I stick with the step decks mostly. The couple random loads i pulled with it I asked in advance what the load was, dimensions, weights etc n if they don't know those things- pretty unlikely they'll have the money I want for it either.