If you have a bankruptcy in your past, it might be a bit more difficult, but otherwise I think a lower score isn't going to effect your ability to get the loan, if it's lower they might require more documentation rather than just being able to give you an instant approval. The best thing to do is just call them, they can tell you pretty quickly whether or not you are approved.
On that note though, I was worried myself when I first started this process. I had nothing really bad on my record, other than some late payments several years back, but my credit score was still low as a result and I was concerned about getting financed. In the end, I qualified for Disney though and through my bank for a signature loan.