I wouldn't jack a heavily loaded truck from the center section, if it's empty then I don't see an issue with it. Theoretically you could bend the axle tubes at the center section if you were lifting from the center. Jacking from the axle under or as close to the spring perch would be preferred.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy