Back in the 80's, I would load up my 2WD 150 the same way. I ended up having to replace both sides leaf springs. So yeah, this guy "minds the mule"!
Both spring shackles already replaced and the springs are off the 1991 F150 I had. I almost sent Black Betty to the grave with the fuel problem I chased but she is running strong and if she decided it was time to go to the retirement home she don't owe me nothing.