75s maybe not, though the armor is thinnest on the bottom and top. 105s, I wouldn't bet on it- 15-20 pounds of HE going bang atop a couple hundred gallon gasoline tank- both American and German tanks- can be real hazardous to your health.
And a German 15 CM/ Soviet 152mm/US 155 round? No thank you very much!
I did some research on wwii and only about 4% of tanks were destroyed by indirect fire.