I built a small trailer based around a small aluminum cargo box to haul behind my Rokon. I use it as a grub box on remote trail building jobs in Alaska. I've had good-sized black bears try to get in several times with no luck. They did leave some nice scratches, though. Also I use a Yeti Tundra 45 cooler with two padlocks which has withstood bear incursions too (so far). But... I have not yet had a grizzly or coastal brown bear try to get in, I am hedging my bets on that one. I also use an electric bear fence around my camps but it's kind of a pain to set up and take down each time you move camp. You likely won't have any problems along the road system in Alaska if you keep a clean camp and put everything away at night. Many of the developed campgrounds here have bear-proof food lockers and trash bins too. If a bear starts giving you problems, the best thing to do is move camp somewhere else.
