Creation
Uncle Sal was first in Incredible Hulk (2023) #1 by Philip Kennedy Johnson and Nic Klein. It is unclear if he is a member of Tank 666.
Major Story Arc
The Incredible Hulk
When Bruce Banner went on the run from The Eldest, with his new traveling companion Charlie, they came across a kind trailer park community in rural Texas. Among this community was Leo, who Sal would occasional rise to protect from the monsters that attacked. Mistaking Hulk for one of those monsters, Sal rose to fight. However, he ultimately helped Hulk protect the community from from the War Devil and his minions.
When the dust settled, Sal admitted to Hulk that he heard the call of the Eldest to attack Hulk, but Ghost Riders are known for their disobedience. He said he was brought back specifically to protect Leo and advised Hulk should do the same with Charlie.