Thank you. It is SEO or could be B05 as the rpo. I know for sure it is 1 ton suspension, 4:10 axles, extra heavy springs and may even include a thicker floor pan (acording to my local dealer). I thought GM, somewhere, would have exactly what it entails, but so far I cannot find it. It must be top secret.
Also the drive shaft may be thicker and some items underneath protected. I have noticed the headliner is slightly different shaped, meaning it may have roof reinforcement too.
For a practical family vehicle, I must say it is overkill and the fuel economy would be in the 6-7 range due to the added weight. I am going to pass on it.
If anyone finds out exactly what it entails, please post it. I am very curious. I cannot find it in the fleed order guide. It actually is listed on the base model indicator “for armored service” after the model number on the factory spec sheet.