None that I've ever experienced. Except on the Alaska Marine Hwy System. Just need to declare prior to boarding so an employee can inspect that the valves are all shut off on all propane tanks prior to boarding the ferry. They will tag each tank or propane compartment that it was checked to be in compliance.
Firewood will be confiscated at all crossings into Canada as well as whatever food supplies the crossing staff are short of. It changes all the time, meat, veggies, fruit etc.
Alcohol is also limited when crossing as well as cash, $10K as I recall was the magic number.
Also, no criminal history, DWI, DV Assaults etc. Or they will decline you entry into the country.
Laws regarding firearms are strict. Ran into a couple at Takhini Hot Springs just north of Whitehorse in 2016. They had entered Canada along the southern boarder, spent time in Alaska and were attempting to reenter the Yukon at the Top of the World Hwy crossing heading towards Dawson City. They had chosen to bring a 12 gauge shotgun with them, had followed the Canadian application and fee process and had the necessary paperwork to transport the weapon with them. HOWEVER the female boarder guard and a trainee claimed the law had changed while they were in Alaska and they were declined entry. They had to drive back to Tok, AK, visit a sporting goods store and get a suitable shipping box for a long gun and pay to ship it home to a friend to hold for them till they returned home. They were not happy campers. They had to drive south back to Whitehorse and then north and approach Dawson City from the south.
If you choose to bring pepper spray it must be clearly marked as a BEAR REPELENT and not for personal protection such as mace.
Bear bells are permissible as it helps the bears locate you when you are out for a walk. I'm surprised they don't sell them at the boarder crossing points.
After living in Alaska for 25 years those are just a few tidbits I'll toss in to help those in the planning process.