As someone who was "upside down" on car payments for most of the 90s, all I can advise is DON'T DO IT, especially if your budget is tight. I bought 3 vehicles in a 8 or 9 year span and got more upside down on each one. I finally saved enough cash over several years to where I could finance a new vehicle and get "rightside up" on a new '02 Dodge Ram. Since then I have saved like a maniac and managed to pay CASH for my last 3 vehicles - all brand new.
You said "I can afford it, but it will make things a little tighter for us, for sure". So there are others (loved ones, I assume) you should be concerned about which makes it an even less intelligent thing to do.
Save your money. Pay off that current loan more quickly by adding something to the principal each month (no matter how little). It may take a few years but you'll be glad you did - and there will be plenty of beautiful like-new Camaros out there when you can truly afford one.
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