IMHO, these trucks are obscure enough that their values will be hard pressed to gather much upward momentum without exposure in a popular movie, or something similar. One out of 20 who ask me about my truck have any idea: 1. That it's not a Dodge. 2. That it's only 50 years old. 3. That it's not some sort of homebuilt improv build, but an actual factory-made military vehicle manufactured by a major(ish) auto company.

The obscurity of M7XX's continues to surprise me, and will continue to be the major factor impeding FJ40-style value increases, IMHO.