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I think you will have a hard time getting approved for a 50k auto loan with your current reported income. Most lender's will typically have a max PTI of 18% which in your case would be 600/Mo max payment. Even with a 4% rate at 84 month's (I strongly suggest avoiding an 84 month term especially on a new vehicle, and a dodge at that) you wouldn't qualify based on PTI limits. Why not look for something cheaper that would be more affordable on paper, until you grow your business and income? You can find a quality, pre-owned truck much cheaper than 50k, while using the money you save in order to re-invest into your business to grow it.
I suspect it will be tough to get done but dealerships only make money when they sell cars/trucks so they are highly motivated to get it done. What are your scores? Income is important but they will overlook income to some extent if you have great scores. The lower the scores the more important the income becomes because they are of course concerned with default risk.
I would suggest a good used dually with diesel powerplant. They can be driven several hundred thousand miles so 60,000 miles on diesel dually is just barely broken in really.
The dealer credit link will result in a hard pull.
Solid scores so you'll have much easier time. I would get a preapproval with Penfed or DCU, that will give you a good indication of what you can qualify for and then you can narrow your options from there.
Let us know how it all works out.
DCU uses mortgage 4 apparently. I read that somewhere around here.