What year is your Voyager? If it was made in the USA, one of it's big advantages is reliability. The older Schwinns were pretty heavy, but they made up for it in reliability.
Of course, for touring, reliability is a BIG benefit.
The Italian bikes are lighter, but they just seem to require a lot of maintanance. I ride a Bottechia for fun, but the frame is a little bit bendy when I put a lot of muscle to the pedals. This fact makes me uncomfortable when considering it for a longer distance tour.
If you can put up with the Schwinn's extra weight, then use if for touring, by all means.
NOTE OF WARNING: The "Made in Taiwan" Schwinns were not nearly as good as the USA or Japanese made Schwinns. I brought made in Taiwan Schwinn Sprint for a Europe tour. Virtually ever part - and I mean EVERY moving component - failed. I limped to the end of the tour in the only remaining gear and left the bike in Germany without any feeling of remorse for the bike.