I appreciate you trying to help. I understand the Texas plate and CHL will raise concerns with border officials. I'm not trying to evade Canadian laws. I respect Canadians to have whatever regulations the populace supports through their elected representatives.
But...if I can legally carry a 20GA pump shotgun in my camper, unloaded, locked, and stored per regulations, I would like to do that. I am not an attorney, but what I read on the Canadian websites my desire looks perfectly legal. I will call the listed phone numbers for clarity at some point.
Between my schedule and the possible crowds in parks I will have to make this long trip next year.