On a 250 no less!
Disclaimer, so far we have only done half the day with her on the back. I run the first half alone, and then she gets on for the 2nd half. We need to come up with some grab bars for her to be able to hang on for a full 80-100 mile day. Right now she just hangs on with one arm onto me and the other onto my PMB rack. One thing we don't do though is bypass anything. We take all options too. Unless there is a hill or something we can't physically make it up 2-up. Usually I just go for it and she grips tight and then smacks me or something after we get thru.