This topic comes up pretty regularly. A static base would have to have VERY attractive features in order to beat out a vehicle in a world where you are fighting alone and a staggeringly large enemy horde could just wander through at any time (assuming you play w/hordes, oc).
If there was a more standardized set of crafting tiers, with the highest level of each requiring strictly immobile constructed objects, like a massive drill press, full restaurant quality stove, a large scale forge, or what have you, then you’d certainly have a reason to build a static base with these things in it.
But even then it’d be foolish to actually try to LIVE in it, given that your own presence would represent a huge risk of attracting attention to your extremely valuable machinery - bad enough that I once in a while get unlucky enough to have a ZHulk take out the welding unit on my DM before I can get out of dodge or kill it. Imagine a couple of them rampaging through your static workshop at the vanguard of a full horde, destroying all the immobile machines you’d spent the last two seasons constructing.
You’d only want to drop by to offload materials and craft up new top-tier gear occasionally, and then move back out into the world with your deathmobile so that you need never fear being overrun by a horde you cannot deal with.
The only time a truly permanent base would make sense would be if you could array a large scale set of automated defenses, or populate it with a significant number of NPC’s, ala Dwarf Fortress, so that you’d have a feasible chance of fending off even a really substantial horde without having to give ground - and so you could sleep without committing suicide.
