Purchasing at Copart auction

I have been researching buying a late model year car on Copart. 

The one thing that I am cautious about is that the broker requires us to wire transfer the money prior to taking possession of the car or giving us the title.

What can I do, to mitigate the risk that the broker wont simply vanish or go bankrupt or choose not to respond after I wire transfer the funds?.

Any broker that you have worked in the past that you would recommend?

thanks.

Autobidmaster.com has worked well for me in the past.

I have purchased a couple of vehicles using Ridesafely(dot)com. One was CopPart, one IAAI. Both purchases I encountered hiccups and they came through.

Can't weigh in on brokers, but I bought my current DD (02 IS300) on Copart. I don't know if you're aware but what you "win" any car for is not what you will pay. My winning bid was around $2200, but I had spent closer to $2800-2900 out the door with all their fees and stuff with NO BROKER. So just be careful exceeding your budget without realizing it.

I tried CoPart recently, free intro membership. 

I found all the good stuff was brokered, and after fees, everything was too rich for my (challenge) budget. 

Your results may vary.

I find lots of cool stuff on there that I can't bid on. And broker fees seem to be more than I can handle. But I did buy my Probe on there, and overall that went okay.

But yeah, the Copart fees and broker fees together would put a lot of seemingly cheap cars over the Challenge budget.

Also depends on state.  I can bid on salvage title with no broker. But clean requires one in TX and power sports for some reason.