Need help on government car auctions PLEASE!!?

Alright well here's the deal I was looking online for governmental car auctions and came across this website called USgovernmentauctions.net and am not really sure about it because to see all the auctions and deals, they're having u pay one dollar for a seven day trial, well anywyas the deal is u have to put ur credit card number and all that stuff in there now what I'm confused about is that I though all governmental websites had the (.gov) at the end can I trust this if it's (.net) or does it matter? If u can just look up the website on google cuz when u type it through google it comes as one of the top websites and is like highlitghted, and all the highlighted stuff is things u can trust right? Sorry for this long story bt thanks to whoever replies :)