[lolife99]

I trim them so I can use a 15"wheel with a max of 4" backspace.
I normally do it on the truck, so I can check the fit,... and just trim the minimum.
I use a thin cut-off wheel and then clean up and radius everything with a flap disc on a grinder.
You can't go in there with a torch.

5-lug 15x6.5 and 15x8 truck ralleys need it.(4" bs)
15x7's dont. (3-5/8" bs)

6-lug 15x8 rally's don't need it, (3-5/8" bs) ,... but the rare 6-lug 15x7's do. (4" bs)

You could plate the bottom if you really want to.
I've been doing this since 1986, without issue.