Oh I'd do it on that bike, looks like you have .25 tires on that - I'd do it. Rack and panniers - stock up on tubes and either CO2 (I prefer that) and a GOOD tire pump (I had a crappy one) or both - bike tools and some spare SPOKES and tube/tire repair kit including chain repair (you can buy multi use tool for this stuff).
My brother did cross country on a roadie - don't know the make of bike but it was a brand name - he did a lot of research on bikes, maps and gear before he left. Knowing him I would imagine he did .23 tires cause he did upper US and hit mountains - but with good tires. He had front and back panniers but I think he ditched the fronts mid way through tour. Get some GOOD tires.
I've done some traveling on this bike using a rack with trunk and back panniers plus camelbak backpack with a bladder. I do and would do again for long distance using Gaterbacks. GOOD SADDLE - my current roadie has a lovely all leather no padding Brooks saddle on it - takes a little getting used too for long distance though. I have another Terry's Gelissimo that I would put on for longer distance comfort (kind of a slim saddle with some small gel in there for comfort) so my sit bones won't suffer. I also Love my front safety lever brake options too - gives you some more options to ride with hands/arms yet with brake options versus just the drops. Buying a new roadie this next year and will have the extra safety lever brakes installed as well.
And yes there are a bunch of people here touring and when you go - let us know where and what you are doing cause it's cool to keep up on people's travels
