The motor plate attached somewhere on the a/c unit should have both the starting load and the running load. Kayteg1 is correct regarding actual vs design but unless something is significantly wrong, they will be close to the same.
'11 GMC 3500hd SLT DRW D/A 4x4 Spray-in, Air Bags w/comp & controls, TL, Superhitch, 48" Supertruss, 9.5t Warn, front rcvr, Fox Shocks, '11 AF 1140, DB, AC, Gen, Solar, Thermal Windows, Wardrobe, Rear & Side Awnings, 18' Lund/40hp Honda 4 stroke