First, welcome to the Forum, if nobody has thought to do so earlier. In particular, your view regarding the possibility of a trap or traps built into the truck most recently owned by TB in the "Alternative Theories" thread is appreciated, even if IMO, it is a somewhat baffling conclusion. The scenario you describe suggests a poorly constructed trap of some kind that involved the physical seats, easily determined by a well-informed LE, so one would have to agree that this "Alternative Theory" scenario is severely compromised. However, of the several viable scenarios, nobody else has suggested this interpretation.
Most importantly, IMO no one has suggested or implied that TB or his family would have been involved in any way with such an issue. Quite the contrary, in fact. Had still operational traps been found by the Black Hats on the test drive and the contraband found to be intact, then there would have been no reason to have murdered TB. They'd have simply secretly removed the booty or arranged to purchase the truck and moved on. The trouble, imo, arose precisely because there was nothing there. TB may have professed complete ignorance about any contraband ever hidden in the truck. In fact, If this contraband had been hidden pursuant to some crime committed years ealier, there is, in fact, every possibility that it was never in the truck during the full period of TB's ownership. On that tragic night, however, his ignorance of the circumstances was not believed. By that time in the heated exchange, he'd also have learned too much and so his fate was sealed.
Your confidence in LE investigator's familiarity with this approach to hiding contraband and their ability to determine the secret codes that reveal them is hopefully well placed. However, the Wired article, dated in March of this year, seems to suggest that quite sophisticated methods may be used to tap into a vehicle's electrical system, primarily to rig a secret code that would provide access to the trap. However, it is essential to note there is nothing illegal about building secret compartments in your vehicle, or your boat, or your garden shed or anything else you own, or having them built either - unless they are later found by LE to contain contraband or possibly evidence of other crimes. In this case, if LE were also to find an empty compartment in the Dodge Ram, there would be nothing whatsoever to incriminate anybody of anything.
With respect to why a murderer or murderers would take measures to try to pin the blame on somebody else, the reasons should be self evident, imo. It seems absurdly doubtful to me that a murderer would confess to a crime and expect lenience arising from his explanation that he figured the victim had stolen his stash or his stolen cash or his weapon used in an earlier crime (for instance) and therefore, in the infamous Texas parlance "He needed killin'."
Early in the investigation, LE appeared to state that TB was not the target of this crime. The target was his truck. An examination of "alternative theories" that could have led to the tragic death of TB is based on the possibility of the accuracy of that comment. It seems to me that are many, if not dozens of possible practical scenarios, centering around that particular Dodge Ram, that might be worthy of consideration. Hopefully it may be possible to entertain some of them here. MOO IMHO.