Boo heretic!

Actually there's a nice gaming side of basing vehicles, especially when consistent application is done across armies is that the question of range is easy to say shortest path b2b. Is it in cover? Does the base touch, then yes. Am I in formation? Measure b2b removing modeling for advantage and modeling with wonkiness occurring (had a fun one where someone true to say that because their turret was modeled where it stuck way out to the left they could measure range from there to the enemy gaining just enough range to shoot. Needless to say, we didn't play after that)
Of course this doesn't preclude other conventions solving thus such as measure from center being a common example.
However for me its become more about a pleasing bit of modeling where I can tell a story as I tend to get my war gamming done via vassal.
What ultimately clenched the decision for me was opinions about vehicles aside, your infantry is going to always be based and therefore the consistency won out.
As Markconz says above, DWWFY. There's not a right or wrong.
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