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If you are keeping it in the trunk and using your cars existent solid state tuner then removing the tubes associated with the radio would be a wise move to save power. If you wire the tubes to take the car's 12V mains directly then why not go a step further and add a DC to DC converter for the B+(you can get them pre-made or design and build your own).
I have a home made car headphone amp designed with sub-miniture hearing aid tubes that has been partially dismantled by me for tubes for a project that I got sidetracked on. Even when I do part it out I intend to draw a schematic so I can duplicate it someday if I desire.
I prefer tube sound to SS as well. If you like vinyl and 78's like me you will find tubes to be substantially more forgiving of record scratch. I can really demonstrate this by taking a worn 78 and playing it through a tube amp followed by a solid state one(my 65 Zenith SS console sounds GREAT on a good LP, but put a 78 on and the record noise overpowers the music).
Also I find the highs on my tube gear to be sharper and more melodic than those of mt better SS gear which makes them feel a bit jagged.
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