The tire pressure from the Metz. brochure doesn't cut/paste very well. I'll try to make it clearer.
RECOMMENDED MOTORCYCLE TIRE PRESSURES BASED ON LOAD
Cruiser/Touring Alpha Numeric Marked Tires (MH90-21, MT90B16, MU85B16)
Front: Solo Riding = 36 psi, 2 up = 38 psi, and 2 up w/ luggage = 40 psi
So the first number is for solo, the second is for 2 up, and the third is for 2 up w/ load
Rear: 38, 40, & 40
Cruiser/Touring Tires (w/ mm size markings)
Front: 36-38, 38-40, & 40-42
Rear: 38-40, 40-42, & 40-42
Rear Tires marked "reinforced" or "50 psi max" on sidewall
Rear: 44-46, 46-48, & 48-50