wth is it?

[oldgoaly]

not mine, only pic I have  some type of bender / alignment tool???

[Lostmind]

WAG -- to adjust a sleeve on steering linkage or a turn buckle on bracing piece
Not sure about that roller on the end?

[oldgoaly]

that roller must make it's way along what ever it is bending or straightening

[leg17]

Might be making some adjustment on something that is moving.
Like metal spinning.

[kxxr]

It looks like a cousin of a "rail fork", a tool that allows one person to turn a long piece of train rail right side up. Those don't have any kind of wheel on them though, so I don't think that is what you have. It does looks very similar.
Rail fork:

[oldgoaly]

does not look like any spin tool I've seen  mine are all smallish ones, you really don't pry in spinning, more like a lever to push the metal around stretching  & shrinking

just guessing on the size, but the magazine is 12-14"??? so the tool length is about? 26-32" from end to end.
 those rail tools I've seen are 4' or more,

[leg17]

does not look like any spin tool I've seen  mine are all smallish ones, you really don't pry in spinning, more like a lever to push the metal around stretching  & shrinking

just guessing on the size, but the magazine is 12-14"??? so the tool length is about? 26-32" from end to end.
 those rail tools I've seen are 4' or more,

Sorry, I  did not mean to imply this was actually for metal spinning, but that picturing that process might invoke some sort of use.  Sorry.

[Chillylulu]

My swag - It brings to mind the top of a library ladder, the kind of ladder that rolls along a pipe at the top with wheels at the bottom.

I don't think that is what it is, just looks like a similar object.

Chilly