what is the factory build code for the UpCountry suspension?

Build sheet says "SDB - Heavy Duty Suspension" is this UpCountry or something different?

For the 2000 model year, my option sheet lists it as:

AWE Up Country Suspension Group
SDUP Heavy Duty Suspension w/Gas Shocks

Why there are two separate but related-looking items on there, I'm really not sure.
 
I haven't been able to find any info on the 99 model year for upcountry suspension. Does anyone know what the "heavy duty suspension" entails?
 
Mine's a 96, has both of these listed:

AWEP Up Country Suspension Group
and
SDUP Heavy Duty Suspension w/Gas Shocks

Anyone got an idea what the SDUP means othe than being redundant to the AWEP?
 
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