I have climbed it several times on my half bike and believe it’s is definitely doable on a tandem for an in shape team. As mentioned above, water is very limited. One other potential issue is the winds can get quite strong near the bottom (first 10ish miles) which can be an impact both climbing and descending. Traffic has never been bad but there are always folks in sports cars or on crotch rockets aiming to set speed records. Ride safe and enjoy