I suspect that, if air is not vented properly, pressure buildup when filling may be able to buckle the floor due to tank expansion at the top. That's certainly not an argument against this reinforcement but someone who sees their tank bulging should rule that out, first.
I'm one of those people. I recently bought an inline hose gauge to measure the usable capacity of my tank. I got only ~25 gallons in my 60 gallon tank before it overflowed at the filler neck. The bottom was bulging to the extent that the drain valve was at an angle, not vertical.
That was a recent observation. I recognized there's a problem somewhere but I have to address that before I can apply this fix for tank sag.
- 2016 Ford F-150 SCrew Lariat 4x2 3.5L Ecoboost, 1700# payload
- 2020 Rockwood 2507S