Tough tank
I think you'd be surprised how tough the tank really is. I hit a large pintle hitch that fell off someone's truck in my lane at about 45mph. Lifted the E off the ground, smashed the front of the tank bar back into the tank about 6-8 inches. Turned it into a pretzel. Tank wasn't leaking, so I took the bar off when I got home. 45 minutes later, I looked under the E and the tank had popped back out. Ordered a new bar, installed it and everything has been fine. No leaks, no guage problems, nothing! That happened about 5 years ago.
Oh, I went back to the scene, found the pintle hitch, and still have it. About 50# and replacement value at Tractor Supply about $140 !