I think the days of a sit down chat with the local guy at the bank, are for the most part gone. Seems like most every thing is done online these days.
My guess is for a 10 year loan, on an older rig from those folks, the interest is going to be higher. As they have more associated risk in that category. ( 6-7 percent would not surprise me)
On the other hand, if you can find a great rig from a private party, in great shape, you will save a ton of money over a dealer, I would think.
Something to think about, sometimes a person is money ahead, to spend a little more, and get something that will last, rather than going too cheap. Breaking down is no fun, and repairs cost a boat load of money.
And the interest is tax deductible. ( so paying higher interest maybe just fine in your situation) depending on what you want to do