That is really not that complicated of a surface. For the main body side, top and bottom planar projections and you could probably get away with sewing the top and sides together to avoid a seam. The tires and the turret would be cylindrical projects. Unfortunately, laying out UVs is a tedious and labor intensive process and there are not a lot of shortcuts. Try laying out the uvs for a model with 1.8 million polygons and probably just shy of 2000 parts. That is complex.

But I am not a great texture painter so I do not always UV my stuff. Although is a typical pipeline is it sthe models responsibility to layout the UV's, but there are folks on the forum that might be able to give you some better advice.