I had a feeling I'd get some great feedback. I'm heading up tomorrow and I have a tote I'm going to try. I'd be happy if I can get everything except my helmet in one bin. I like my helmet bag but if it fits in there, too, even better. I figure I'll also bring a soft bag for non-riding gear and toiletries.
I'm sure you guys have something similar, but I have always had a tote just for trailering. Small jack, extra bulbs, jumper cables, duct tape, electrical tester and crimping tools, etc. It also goes with when I tow the boat.