I was hit on the driver's side of my '78 C10 a few years ago, and those gas tanks were on the outside of the frame, by a drunk driver going 65 MPH trying to run a red light. She hit it dead on and it still did not explode. (Thank God no one was with me at the time because the whole passenger side was demolished!)
5.9 ZJ bone stock.
If it ain't broke, fix it til it is.