This store also has a 46cm Disc Trucker from 2017 which is $1795 plus tax. These are also not available to test ride.
Why wouldn't they let you test ride it? I wouldn't buy any bike that I couldn't test ride it or a similar model beforehand.
Fit is very critical for touring; you're in the saddle for hours each day and if the fit isn't close to perfect, there will be problems.
In your situation, with a significant difference in leg length, you really should have the fit dialed in before heading off on two long tours.