GMC 1994 Sonoma Owner's Manual page 267

Truck Loading Information
1. Recommended location for cargo center of gravity for cargo weight
rating.
Refer to Truck Camper Loading Information label in the glove box for
"A"and "B" dimensions.
0
Use rear edge of load floor for measurement purposes
Example of Proper Truck and Camper Match
1. Camper center of gravity
2 . Recommended center of gravity location zone
The camper's center of gravity should fall within the center of gravity zone
for your vehicle's cargo load.