Questions on tow vehicle, considering 8.1 Burb

Another issue with the 8.1L was piston slap during startup. I also had issues during steep, slow climbs in the heat with it. EFI would pump hot fuel back to the fuel tank after not being used by the engine, flowing through the hot engine compartment and then back to the tank. After about an hour of that - either the fuel pump and/or vapor lock and the engine dies. I got lucky twice and stumbled to the side of the road, opened the hood, cracked a beer and waited 2 hours and continued on.