can someone identify this wheel?

[88Jimmy4x4]

I picked up a set of these 15x8 4x4 GM 6x5.5 wheels.

• were these sport truck wheels?
  
• what years were they offered etc?
  
• someone rattle canned them silver, were they white from GM?
  
• Did they come with trim rings?
  
• are these rare at all?
  
• Did GMC and Chevy both offer these?
  
  

Im going to have these blasted and powder coated soon so any information would be appreciated.