First off welcome.
Second, you posted in the wrong forum. I have asked the moderator to move it for you.
Now, to your question. Interest rates are based on your credit score. Low score, high interest rates or no financing. I think you would be far better off repaieing your credit rating first before you go into debt for a depreciating asset. If you really want to get an RV, start selling other stuff,get out of debt, and prove to your lenders you are a good credit risk.