As said b4 have your papers (passport for re-entry into the States und other important papers - vet etc). BIG item on the checklist is: GUNS
Don't even thing of hiden those in the RV. If you can, leave those at home or in storage south of the border. Driving is easy here, roads are great. Of course in summer you'll find lots of road constructions.
Speed and Distance is in Kilometers. We have very few cops on the road.
No WOLF packs here, compared to WA.
Schoolzones speed is 30 kmH between 8 am and 5 pm during schooldays.
May is still schooltime.
Have a safe trip
Remember what BC stands for = BRING CASH (CC are ok too)
Report, if you have $10,000 or more in CASH with you.
They count your purse too.