Spray the belt with belt dressing, tighten it up, or buy a new belt.
Probably due to slipping when they get wet. Your belts might need to be changed.
that truck has 4 belts that may fit. 2 belts with ac 2 belts without. you need a size 55
Belt slipping and not turning water pump?
If the belts were misaligned you would have more problems with the belts slipping or falling of. I think it sounds like you may not have enough slack. When the belts are tightened you should have say a few mm slack where you can tug the belts up and down with your finger.
Check your alternator belts. Might be slipping or broke.
Check all engine drive belts. Sounds like one of them is slipping.
Probably one of the fan belts is loose or glazed from slipping. Before you start it next time take a bar of handsoap and lightly rub it across the underside of the belts. If the squeking stops you need to have your belts checked and/or replaced.
They snap to the max.
IT usually just goes !!!!! it doesnt warn you first!! other aux belts may be slipping if theres screetching noise! always change suspect timing belts!
To protect you if an accident ever happens.
Possibly loose belts slipping on the rotating pulleys. Need tightening which isn't a complicated job but need to be careful not to over tighten which could cause damage to the pulleys and the belts could break if old.
You did not define "squeaky" but if there is a shrill noise when you startup or accelerate under engine load then it could be your serpentine belts slipping. Take a look at the 3 belts and see if they are glazed (shiny). If so then it is best to replace them.