The 3R is tough as well. I’ve yet to use a ground cloth, even on the car camping trip, and the most recent service trip required camping in a meadow filled with rocks, briars, and nettles. Stephenson’s silnylon came through without even a scratch.
I have owned a 3R for more than 20 years and finally replaced it with a 2R. Both tents have the side windows and use them often in the summer. I used the 3R for more climbing and backpacking trips then I can recall and never had a problem with it.
The Stephenson's Warmlite 2R is a strong, spacious, and exceptionally light non-freestanding tunnel tent that is still made in the USA in Gilford, NH. The tent uses high quality materials (though very thin diameter poles) and provides lots of space for a mere 3 lb. 4 oz. The 2R can handle fierce winds as long as its pitched solidly.