Why the KLR ?
If you were buying a bike to sell when you got home, why did you purchase the KLR? For a two-up 1500 mile trip on pavement it seems many other bike choices would have been more suitable.
Something like a used V-Strom would have been similar in price and much more comfortable, especially for your wife.
Note: I ride a Strom and a DRZ 400. And I love the KLR.