I don't, I have a Colorado insurance card, and I'm required by colorado law to register any vehicles I own in colorado within 90 days. I can't register it in colorado without it being there though.
Inspection stickers are not required in my county, but they have a mandated "VIN inspection" that must be performed before they will allow me to register the vehicle in Colorado.
I've taken cars the be inspected for friends and used my DL for their cars. If you have a ins. card for here and registed here just get a friend to go with you.
If your vehicle is registered in a municipality that has it's own sticker, you are suppossed to use that, but most LA places will give you an LA one. My vehicle is registered in NOLA, and the ones around here will not give me a LA one, I must go to a NOLA place .