what exactly are you looking for? like just good pictures of stock trucks just for fun....or are you looking for stock photos (i.e. commercial usage images)...
if you're looking for some images to license for commercial usage, be careful just taking them off the internet. copyright laws with things like that can get you in deep water, along with truck stuff I am in with alot of the photography people and unlicensed usage is something that they don't take lightly. just FYI since not everyone is aware of stuff like that.
if you're wanting to get something specific and licensed for commercial use I could probably help out. I can shoot up to 36MP single images through professional grade high end glass (for auto stuff I typically use a 24mm tilt shift lens for perspective control and expanded DOF, but I can shoot anything from ultrawide to supertele). if you're wanting more than 36MP images (7,360 x 4,912), I can do a matrix stitched image of whatever resolution you want.