I picked up this dump truck today from a dollar store (well, "dollar" store...it was $3. But whatever. What caught my eye was the cab section, as it really looked like a tough kind of truck cab, and actually seemed to be about the same height, length and width as the Battlewagon:
So far, I think this might work out - even with the addition of a few armoured plates and an out-cropped door (to say nothing of a reinforced windshield armour) this looks like it'll be able to adequately resemble a Battlewagon. The interior is also big enough to accommodate a boy driver!
Thanks for viewing!