I had a flat while at home. I jacked the vehicle and removed nuts. Rim would not come off. I took the eight pound sledge and "tapped" the rim and wheel without damaging it, but no luck getting rim off.
I finally called AAA road service because I am old and wifey told me to. They were here if under thirty minutes. Drove up in a old beat up car, no service truck. Driver goes to my car looks at it, kicks with foot and taps with his rubber mallet, no luck.
Then, he walks back to his car, grabs a can of WD-40 and sprays center of rim and lugs. Puts can back in car and by time he gets back he simply lifted flat tire and rim off without another hit.
Now WD-40 is standard in my cars, both of them. Ya never know.