It is common for Ranger rear brakes to be grabby after sitting overnight in the rain.
I am fanatical about keeping my rears well adjusted (due to my aggressive driving style) so I press and release the parking brake hard repeatedly several times a week and I also drive backward and apply the pedal brake aggressively to make the self-adjuster click.
I had a previous set of rear shoes that had the grabby syndrome. To help that, I used to apply the parking brake (enough to cause noticeable drag) while driving to the end of my street (stop sign). After that, it would not be grabby (basically scrubs all the rust off).
It wouldn't hurt to pull the drums off and do a thorough inspection, for safety's sake.
2000 2.5 MO5D 4.10 one-wheel drive DD - gave to my older son
1990 STX 87 2.9 going in.....Junked it
2000 3.0 4WD M05D 4.10 S-cab Off-Road package with 235-75-15" tires, hotrod DD, lol