New or used? I'll share what I know about financing because I've bought and sold so many rigs over my lifetime - lost count. I know nothing about that specific unit.
For a new unit the dealer/manufacturers sales order with selling price should be sufficient for a finance source. My recommendation is always to check with your local credit union - they are easier to work with, less fussy about numbers, better rates, and more likely to lend you what you want if you have good credit.
This manufacturer doesn't have any dealers in the states? If so why not get one from them and perhaps they can assist with a finance source.
Also, if it's not a lot of money and you have good credit you can probably get a signature credit line, credit card, or even a heloc that would cover it. The term might be shorter than you'd like, but hey, you just get it paid off faster that way. Seems like a model 1723 is likely a 23 footer? Can't be talking about too many $$. If it is a hi-budget unit then why not get something more common to the US market?
Oh, and WELCOME TO iRV2!