Is my parking brake seized?

I had my 2011 4 cylinder 2.7L on rhino ramps to change my oil while my parking brake was on.

After I finished the oil change, I forgot my parking brake was on, and tried to go in reverse. It didn't take me long to remember my parking brake was on, so i released the brake.

There was some resistance at first, but I was able to back up off of my rhino ramps. I put the truck in drive, and tried to go forward, and the truck barely moved. I tried again with more power, and was able to go roughly 15 miles an hour for about a hundred feet before the truck wouldn't go any further.

I tried really pushing the gas pedal and the wheels spun, but the truck stayed in the same place. I put the truck in reverse to back it into a parking space, and it worked, but again with resistance.

Is this a parking brake issue? The parking brake light is not on, but it was on when I was on the rhino ramps, and turned off when i released the brake to back off of the ramps.

Let me know what the problem could be and how to fix it, thanks!

 

First guess is that the parking brake cable has seized in its sheath. Happened to me. Where it passes through the backing plate, it can corrode and swell causing it not to be able to release

 

If rear wheels are spinning, it sounds like your front brakes are seized, not the rear. I don't believe that parking brake utilizes the fronts

 

You say wheels spun.
Could it be one or the other wheel spun?
Your parking brake could be releasing enough to let the dash light go off, but not enough to release the brake shoes completely from the drums. They're dragging on the drum.
You could try grabbing each cable and moving it back and forth, up and down. It may be enough to add some additional space between the shoes and the drum. The cable would be on each side on the front side of the plate going in. I don't know how to best describe the parking brake cable going into the rear brake housing/drums.
I live in the Rust Belt and regularly use my parking brake to avoid this. Nearly every time I park my parking brake goes on, it is a habit. This is the case of use or lose it.

 

An open differential will spin one wheel with the E-brake on.
The little 2.7 won't push it far on dry pavement before it "stops".

You need to jack up the rear end and see what wheel or wheels wont's spin in neutral.
Make sure to chock the front wheels. The truck is free to roll as soon a the rear wheels are off the ground.