There are a few things I'd change before getting into texturing:
Most obviously the headlights, their tricount can be reduced quite a bit (you can try collapsing every other segment or just remodelling it).
Then the bars pointed out, not as bad as the headlights but they can still do with less I think.
The verts around A can be welded down to the verts that create the actual silhouette, shouldn't lead to any smoothing issues from the looks of it.
There seems to be an edge through the middle of the windshield, probably left over from mirroring. You can remove that and any other edges like it, if they don't contribute to the shape.
The gun looks like it could do with more detail (although I can't see it very well from this angle nor do I know what it looks like irl). The barrel looks like it might have too many sides, although its probably fine since it'll be manned.
The wheels might benefit from a slight chamfer on their outer edge loops.
That's all I could notice. Its looking pretty nice overall though!