I have an 8" VGA LCD (running at 1024x768 currently and it displays great). It is also touchscreen. The brand is Lilliput. If you search on ebay, beware, there are 8" Lilliputs that are VGA, and 8" Lilliputs that are just plain old NTSC.
I actually bought mine from a company in Hong Kong. It was SUPER cheap (considering). I paid almost half what they are selling for from us online retailers. I paid something like $50 for shipping, but that was **3** day express mail from HK, incl. insurance! ($239 + S/H - most places are selling them for around $350-$380+)
THis is the place:
http://www.ex-audio.com/shop/index.phpBTW, excellent customer service as well.
You probably don't want the y" model as that one is 15:9 Aspect ration (yes, 15:9, not 16:9).
Also, if you have room in teh cab, but just want a smaller picture, get a 14" VGA monitor and use the controls on it to shrink the picture down so it doesn't fill up the whole screen/tube.
Brain21