They are diesel engined rigs though... I think as traffic picks up then more forums will be added, since it's so light right now though less is more.
Pretty much what Shag said, as the site gets more traffic we can then start splitting up and/or adjusting forums, you don't normally want to many forums when you first start a new site.
I'll third, we need as much traffic through the current forums as we can get and splitting up the forums won't help right now. Besides literally just a couple of 6.2/6.5 guys, it's just Dmax GM owners here.