My experience has been that Fender-style necks are very stable. I have an '06 Fender '51 P reissue that came from Japan in a cardboard box: it has required one tweak to the truss rod, about 2 weeks after I got it. I have or have owned three other Ps and a Jazz, and I believe I have never had to adjust any of them, including the J which was shipped here in a trade from the Pacific Northwest. That Jazz Bass, by the way, had the lowest action without fret buzz that I have encountered.
I also owned a Carvin LB20 bass with a laminated mahogany/ebony neck that needed to be adjusted nearly every time I pulled it out of its case.
The single bad neck I have encountered was on an Indonesian-built Squier P, because some idiot had cross-threaded the truss rod. I sold it for what I paid for it, so no harm done, but that was not a fault of the instrument.
"Digo: 'paciencia, y barajar'." -- Don Quijote de la Mancha, Part II, Chapter 23 / TX bassist #48 fretless #233, Fender P #242, Godin #21, StingRay Club #468