On the other hand I expect that the story of the Tumlinson saga, along with Travis' own motives in all of this will be directed more towards Travis' relationship with Clyde Barrow and Bonnie Parker, and what may have happened to the proceeds of their crime spree. Bonnie and Clyde were looking for Travis, and it wasn't because he didn't deliver the groceries. At the end of THAT trail, Travis had the cash/cache and B & C wound up dead and fulla lead.
You may actually be close to the bone here, hiker. This whole Travis/Clyde relationship is intriguing to say the least. Since we don't know what it actually was, we can speculate. No law against speculation. Until we do know all the details - if that is even feasible - many possibilities remain on the table. I know Ryan says, "No, no, no," but ... hmmm.
Fact: we know that Travis and Clyde had some sort of relationship beginning when both criminals served time together in a Texas prison in the early 1930s and apparently continuing after their releases. This later contact - whatever it was - happened during the Barrow Gang crime spree that included 12-15 bank robberies, possibly dozens of other commercial robberies, and at least 13 murders.
Fact: the bank robberies alone averaged about $2,500/pop. That's about $35,000 cash, total, early 30s dollars. That's about 1700 ounces of gold @$20.67/tr oz. To put it in perspective, in today's money, for the bank robberies alone, the gang walked off with maybe $2,250,000 cash ($160,000/bank).
Speculation: assume half or three-quarters of the bank loot can be accounted for - recovered; divvied up among the gang; the cost of doing business; and the daily expense of living like bank robbers (ha ha). That potentially leaves a quarter of the loot, $500,000 (three or four robberies worth), that remained unrecovered and unaccounted for following the end of the fun for Bonnie and Clyde in 1934. We can further speculate that the gang might have cached some or all of this along the crime trail.
Speculation: let's put our tinfoil hats on and wonder if Clyde might have asked his old con pal Travis about a good place in Texas to hide some cash until they needed it later. Let's say they hid a couple hundred thousand or more (today's value) and died in Louisiana before they could come back for it. What would keep Travis from harvesting a couple bags of cash that Bonnie and Clyde would never have a use for? He may have provided the hidey-hole.
Speculation: Q: "Where'd you get the money for that new car, Travis?" A: "Arizona. Yeah, Arizona - it's a secret".