It's curious that you would be on the first page of Yahoo and MSN but not Google. Looking at your site it doesn't look like they're trying to punish you for anything, which anyway would get you blacklisted completely, not on page 10.
Shocking as it sounds, the first thing I can think of is competition. There have to be more web sites than people alive today, and some fraction of them that are devoted to van racking is still a lot. All of these sites also want to make it to the top of the first page, and are doing what they can to make that happen. Still, this wouldn't explain the difference between Google and the rest of the search engines?
The short answer is you need for there to be more web sites linking to yours using the
<a href="your site">anchor text</a> "van racking." The a tag is an anchored link, and the text you can click on to follow it is the anchor text. It tells googlebot your site ( or, the one being linked TO ) is about whatever the anchor text is. If you want to learn more about this concept, go see this site...
There are two basic ways to get these links: create them yourself, or get other people to do it for you. The second type counts for more, because it's harder to do. You could change your signature here from "gimme talkupation!!!" to "
van racking." I just gave you a link with your targeted keywords; you can give yourself one every time you post. Of course, then you want to make sur your posts are useful and intelligent. You can go add yourself to every directory out there; nobody uses those sites to find a link, but the 'bots see them. These are all "low quality" links, easy to get, and things your competition has probably done already.
Then there are "high quality" links, where someone else mentions you on their web site. People say things like "content is still king" meaning that a useful web site attracts links and traffic. To do this, you probably want to add things to your site that widen its appeal beyond people shopping for van racking. You could write an "article" on what you do, how it affects the resale value of a van, things like that, stuff a couple of links in it, and email it to other sites that are related to cars and vans, but not so much racking. A few of them may be interested, and carry your article, which means links from their site to yours, with anchor text of your choosing. Things like that.
One last bit of advice, and I hope I don't get yelled at for saying this. You're giving aid and comfort to the enemy. It's a great thing that you've linked out to other related sites, because your visitors will like that. If you're too far, but they can find someone closer through you're site, they'll remember you in a positive way.
But, you have these links out with the text "van racking" in them. These help the sites you're linking to, to score on searches for "van racking." Even if those two words aren't on the page you link to. If you're coming up on page 10, then you aren't helping them much, but you're still working against yourself. Don't take down the links, but consider taking the keywords you're trying to win for out of the anchor text.