Another option would be to buy a used OEM pump off another member who is upgrading as a precaution. I sold my factory pump to a guy who runs hotshot loads around the country and wanted an OEM spare.
Be advised that changing the factory lift pump on the side of a highway would be no fun. It's buried behind the filter canister, and your best access would be pulling the front driver's side tire and inner wheel liner. You will need an allen wrench for pulling the 4 mounting bolts, but two of them are hidden on the passenger side of the pump and are done by feel.
The Glacier Walbro system is a much better way to go. In addition to all of the pump advantages, it mounts under the frame and is much more accessible in the unlikely event it would fail. Plus, you can buy a spare Walbro to carry with you for only $120.