I think the family made a big mistake not using a treasure hunter for their research. A good Thunter wouldn't need such a large costly learning curve. Why they were against it is their business. It just seems to me that It'll take a lot longer for anything at all to be found. The treasure they discovered is their own family history along with Travis's after death wealth. I think the treasure hunt was over when RG discovered all that property in the storage unit.
Now that we have a taste of what really happened behind the scenes it only proves more of what we already know.
Travis was a buffoon, a shyster, and not a very nice person. Who could believe anything he had or wrote?
I'm not saying his story is not a very good read that is if you like fictional productions. I would've watched the show for the history and wild interplay. He did have an interesting life. I for one would jump at the chance to help in solving his maps for nothing in return as I've done for so many others. I've even financed a few myself. The hunt along side people that look out for each other is all I ever need. I give my two cents and advise when I think it's useless or it's not worth dying for. I've never charged a dime for my services nor have I asked for any percentages. Treasure Hunters are a rare breed and most are honest. Some you may have to look out for. Travis was one of those.