trailers are great, but they're not cheap. if you can borrow one, or another time of touring set up, for your first tour, as gotham said, it will help you decide on what you want to invest in down the line. depending on when you are going, i can lend you mine
brooks saddles are no more inherently comfortable than any other saddle, ime. the key is finding a saddle that works for your body type and position on the bike. wtb and specialized both have "fit programs" if you can find a place that runs them. they should be able to help you identify the model and size that works best for you
Thanks for your advice. I might take you up on the trailer rental offer.
As for my saddle, it might not be my chromag saddle as much as it's getting used to being on the saddle for a long time. Most of my rides are 1 to 2 hours and I have no issues there. But the admittedly rare 4 hours and I find my chamois isn't what it should be. I should probably just spend more time in the saddle and get better chamois. I usually use the MEC liners and they're on the thin side. If I find that's not helping I will check out the "fit programs" and have my sit-bones properly measured etc.