I agree with that and have 1999 diesel fuel still stored that my bug-out van seems to start and run on just fine (it has been treated with PRI-D). There has not been any significant bacterial growth and apart from some inevitable acidity, seems to be perfectly usable. However, I certainly wouldn't recommend putting it in a new rig except in dire emergency.
Propane is even better. Tanks can be buried, no transfer or pumping required, and you can also run your propane furnace, gas logs, stove, etc off it if need be.
Plus propane absolutely does not degrade, diesel will grow stuff if not treated at regular intervals, and propane isn’t prone to picking up water.