getting financed

I am currently in Iraq working as a "contractor" and im going home in 3 weeks and going to be picking up the 2007 Yukon Xl that my wife ordered. My wife and I are only 23 years old,shes a stay at home mom and we both have average credit but I make $150,xxx + a year and we are wondering how much the dealership will finance us for. Im hoping to talk them down to around 40k-45k on the truck and I can put down 20k at most but I dont know how it works on them figuring out how much we can finance. Since we are so young im worried they wont finance us 25k or maybe 30k. Anyone who knows how that works and what they look for, for how much they will loan you please I need help. Thanks

First I hope all is well and safe for you in Iraq. If you make $150,000 and can prove your income you can finance the entire amount, as long as you have some established credit.

Even without a credit history you can probably get financed but with a nasty APR.