Habbi-

I've got a Chevy 1/2 ton that also has a left rear wheel I haven't been able
to get off with a Ingersol-Rand 1/2" impact wrench. The right rear came off,
but only after a lot of time with full force on the impact.

The last time the wheels were torqued was at a tire shop, so they may have
hit them too hard in my case.

However, I have aluminum wheels on my truck and I'm wondering if an
interaction between the steel lug nuts and aluminum wheels has caused them
to "corrode weld" together, does your truck have aluminum wheels also?

Paul T.