Inadvertently banging a tube and torquing the receptacles/pin clips in the socket will give you added work- more than simply pulling and replacing the tubes, you may have to tighten or repair the tube socket. In addition, even a relatively "smooth" ride in a car might cause some tubes to become (partially) unseated from the socket. I have found this to be the case even when lifting and moving a tube amp within my room- I always check that the tubes are seated fully.
Thom Mackris’ comments about guitar amps is true, but I seem to remember retainer clips on a lot of tubes for precisely that reason.
Thom Mackris’ comments about guitar amps is true, but I seem to remember retainer clips on a lot of tubes for precisely that reason.