There are lots of postings about US Citizens being warned about taking guns to Canada but be aware it works both ways. As a Canadian heading to the US this fall, we crossed the border and our vehicle was searched for an hour due to my stupidity. I had a sign on the storage box of my ATV trailer similar to the one in the picture. It was more of a joke than anything and I never thought it might be taken seriously. It was a trigger point (pun intended) for Homeland Security and they were doing their job.
While being interviewed we were asked if we had any weapons. The answer was "No" and was the truth. Then the agent said while looking at his computer screen, "but you have weapons at home". The answer was yes. I believe he had access to Canadian information that I have a Possession and Acquisition licence for firearms. The two countries really are sharing a lot of information with each other. Sign is now gone and I hope I don't waste another hour at the border next time.
1998 Carriage Conestoga 3742