Squeaky Brakes On Rams

Could just have some sand embedded in the pads too. One of my work trucks had a similar low pitch squeal forever, after making a mud run through a jobsite. No amount of cleaning or hard braking would change it. New truck so no rust/sticking slides.
Amazing how long those little pebbles last!

It's not a problem unique to Ram trucks. It typically means that the brakes are tight, meaning a pad is stuck in the slider or sticking. If it's been long enough you'll see the dirt on the wheel. When the dirt turns red the pad is done. RF is the culprit most time.
Inspection at each oil change/tire rotation is the answer, and that means more than just pad thickness.

Brake squeak is right at my tinnitus frequency so it doesn't bother me.

Drives my wife nuts though..."Fix your brakes!" lol

My 2015 does, only when they are warm. Forum searches reveal it's quite common...

Apples and Oranges, but I had an F250 that did that.

i would put it in reverse, get her spooled up and trounce on the brakes. Three times and the squeak would go away for a long time. :h

I have not experienced that

Dust, dirt, pads hanging up a bit or lack of heavy use.
Wouldnt think your truck would have the sliders froze up. But if you’ve power washed The wheels good, then try getting the brakes some use. Go do a few hard stops like you’re bedding new brakes and it will likely take care of it.

Also lubricate all metal to metal parts along with slide bolts.

No, not common.
The times I thought my brakes were squealing actually ended up being dry U-joints.

I would remove the pads, clean the backing plates and apply a layer of caliper quiet. I would also check to ensure there isn't rust build-up between the caliper and the pad slide clips (if applicable).