I have had a set of Serfas Drifters for the past couple of thousand miles (1.5") and they have held up well. I weigh well over 300 pounds, so they should work for touring.
As with the comment above on the Barrista I run at higher pressure than the 65 psi listed on the web site. I think I tend to run about 80 psi. It has been a while since riding weather.
The inverted tread has done well for me on the road and packed gravel rail trails