Very common. Aluminum when it oxidizes grows slightly dimensionally. After cleaning the crud off, put a very, very light coat of anti-seize around the steel hubs on the truck before remounting the wheels. You'll never experience this problem again. Be careful to not get anti-seize on the studs though.
Had to beat all 4 stock LX570 rims off with a rubber mallet when I first got the truck. Solid whacks on the tire in a circular pattern until it pops free. Same procedure, cleaned up both surfaces with a wire wheel and a light coat of anti-seize. Had the same thing happen on my FJ with TRD wheels.