There has been a rash of crack downs but it has been aimed more at the guys with welding rigs slid in the back of the 2500's, overloaded mechanic trucks and those huge Sled Racks on the back of 1/2 tons. Also they are trying to get all the 1/2 tons with huge 5v'ers off the hills as they don't have the power or the braking ability.
I doubt they would want to give the gears to an honest tourist. Really IMHO the company you buy the trailer/camper from should not give it to you if you show up with an under-rated vehicle. Its all about safety on their (BC) narrow mountain roads.