HO/20MM grav vehicles etc...

the folks at GDW used ROCO figs for all the vehicles in the pictures 
from Striker 2 among other things.

The Marder Hull with some mods works well.

The Cover of Striker 2 shows several examples of this
although the infantry figs look like Games Workshop
Imperial Guards, the vehicles look like Marder
hulls. I have gamed with the GDW folks, and they
always tended to use whatever figs looked good for
playtest games.