camper special 8400 GVW?

[oneday1]

OK..maybe a stupid question but haven't been able to find a decent answer. My 78 c15 camper special has the camper special 8400 GVW decal. What does that even mean? The GVWR is 6050. Its my understanding that the GVWR is the maximum weight allowed fort the vehicle and cargo whereas the GVW is just the weight at any particular time (not static). How then can the GVW be 2350 lbs. over the max rating? Of course the truck doesn'tweigh anywhere close to 8400 (or 6050). So what is the 8400 GVW decal for? Thanks in advance for any help.