Choc55,
OK, I'm white. And I'm not exactly hung. I'm quite average. I am somewhat muscular and chubby.
That being said, so you know I'm not hitting on you, you should check out the Bear Community. There are guys of all shapes and sizes there. There are Muscle Bears with big white dicks who, I assure you, would love to have a gbm chub. I have muscular guys hitting on me all the time. It seems like many gym rats like guys with a little something extra.
I live in Oakland and I see plenty of chubby black guys with muscular white guys. Now, I don't know the status of their equipment, but at least it's in the direction you want to go.