I saw a guy biking down the Springwater Corridor with a full-sized mattress balanced on his shoulder. I don't know how he did it.
I've got an xtracycle, but it's used primarily for hauling the boys. The most I ever carried by bike was when I had my friend's bakfiets for a few weeks, and helped another friend move in to their new place when they got back from a summer in Finland.
Not nearly as impressive as some of those other loads above, but it was fun to know I could move all that by bike![]()