You will also note that after the Red Oxide primer I've used some extra products. I have some Valejo Red Oxid [sic] paste, if you're after texture paint and need a decent quantity you can't go wrong with this. I used it to fill in some of the flat areas around where I'd sanded the base to attach the feet. I also thinned it down to add rust texture on the body. I then added Martian Ironearth in places because these are going to be all kinds of battered.
This is the plan - I'm going for a very battered yellow, which I appreciates fits very differently with colours of the rest of the Free Radical Collective but these are all construction vehicles and just because you're driving around in a CAT or JCB doesn't mean your work clothes are bright yellow.