There are no tricks in the Grays bidding system, it's just that it's all a bit different to what we've become accustomed to with E-bay.
There are two ways to place a bid, a standard bid or Autobid.
A Standard bid is just like if you were physically standing in an auction room and call out a bid. No matter how much higher than the previous bid, it becomes the new price until outbid in turn (unlike E-bay). Sure, you cold throw in a bid on a GS for $109, but there is no way that will ever get up. Bidding $509 for a Unimog is just a joke. You could fast-track the process by bidding $5009, but still not be certain of winning. You will need to place another bid each time your outbid to stay in the running. However, placing early low bids on a number of vehicles could work to your advantage after you have had the chance to inspect the vehicles on inspection day.
The other type of bid is Autobid. The bid price will only go to an amount to exceed another previous bidders amount, provided it is under the limit you set (same as E-bay). If other later bids are placed by others, the amount will be the same as their bid, but you will remain the winning bid as your bid was placed first (different to e-bay). The winner's time stamp on their bid will be earlier.
At any time, you can increase your bid, even if you are winning at that time, and can place a standard bid or autobid. So in the example above, you could place a standard bid of $5009, then top it up withan Autobid of $8009. You will only be shown as having placed 1 bid (different to E-bay, which will show 2 bids), and will continue to be the winning bidder up to, and including, a bid of $8009.
If another bidder bids $8109 or higher, they then become the winning bidder. You can then place another bid of say $8509, and the time stamp for your bid remains the same as your very first bid. The earlier timestamp works to your advantage in the case of any equal bids, so just like voting, you should BID EARLY AND BID OFTEN!
This is not an unfair set of rules, it's just different. Maybe it does encourage bidders to get involved sooner rather than just be a watcher, and it does prevent "sniping", but ultimately like any other auction, it's always the highest bidder that wins.

