On the F53 if the engine battery shorts it can cause the ECM to fire well before TDC and lock the engine causing a skid. I was going slow when the engine battery in my 2001 shorted and it created a massive jolt that locked up the rear wheels for a moment. If I had been going any faster something for sure would have broken such as the crank, drive shaft, differential, rods, etc. I am glad I was just in the parks driveway when this occurred and swapping out a house battery for the engine battery got me going again with no apparent engine damage.
Lesson learned on a computer controlled engine do not ignore signs of battery failure. I had to use the boost switch to get started the day I arrived at the park and had put an automotive charger on the engine battery the night before I left and was planning on replacing it when I got home so I am supposing that when output from the alternator got high enough as I got past 5 mph the battery shorted. Glad it did not blow up and add that extra mess to deal with. Battery was never very low on water either and I always used distilled water to top it off. It was a just out of warranty Never Start from Walmart.
I can see this easily causing a broken crank especially if it happened at highway speeds.
2001 Winnebago Adventurer WFG35U