I'm with John on the gearing issue, at least if you're going stock. The Vaya 2 has a low of 27 gear inches, and the Vaya 3 has a road triple that goes down to 24 gear inches. The LHT, stock, goes down to 20 gear inches, also with a 26" wheel. That's two more lower gears on the LHT.
Is 4" / 2 gears significant? Only when the hill is steep, the ride long, and the load heavy. If you commit to packing light (inn-to-motel makes this easy), keeping daily mileage low (stay where there are appropriate facilities spaced closely), and out of hills (like the Appalachians, Ozarks, Sierras, and Rockies, also known as the more scenic parts of the U.S.), then you can forget about needing lower gears. Otherwise, either go with the stock LHT or plan to upgrade components on the Salsa. Be aware that upgrades may ratchet the price up rather quickly.