To exchange old truck

We need to sell one of our old truck in our company. We are thinking of purchasing a new one by exchanging the old truck. I think this amount can use as the down payment. We are planning to arrange the loan through Truck Loan Center(http://www.truckloancenter.com/). What will be the maximum loan amount we can get for this? Can somebody give an approximate idea? Also if you have some truck to suggest for a construction company, please share that too.
 
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