It appears the weight class badging was deleted from the front doors on Suburban at some point early in the 2001 model year. We have found 7/00 and 8/00 built 2001 models with the door badges and a 10/00 built 2001 without them. I have yet to come across a 9/00 build to confirm when it was deleted for sure.

I found a 9/00 built 2001 1500 LS that does not have weight class badging on the front doors.

Another thing of interest, at least to me , is most 2001 model year Suburbans are Mexican assembled, while most 2001 model year GMC Yukon XLs are United States assembled. I did find a few exceptions,

12/00 Redfire Metallic C-1500 LS - 1GNEC16T31J189945
6/01 Redire Metallic C-1500 LT - 1GNEC16T81J305530
7/00 Indigo Blue Metallic K-1500 LS - 1GNFK16T91J100421

Also, while I'm updating, Z71 badging was changed for the Tahoe and Suburban in 2005.

2004.
C-pillar:

Rear hatch:


2005.
C-pillar:

Rear hatch: