Read the rules and comply as best you can. Take off your hat, hand them passports or equivalent and answer directly the questions they ask. Don't volunteer any additional information.
Don't worry it's not like you're going to a foreign country - Ohh that's right you're going to Canada a foreign country.
Fill up before crossing the border and understand how fast 80km is.
Our Visa card has no Canadian transaction fees unlike our AMEX - guess which one we use in Canada?
Have a great trip - We're thinking of Vancouver this summer and Alaska next year.
Likely they will ask you about firewood and guns - don't have any. You can take limited alcohol.
Food varies as the winds blow. One time we could not bring tomatoes and green onions into the US where we bought them - regulation went into effect that day. Agent scratched our cat and never asked about her shots etc.
2009 Holiday Rambler 42' Scepter with ISL 400 Cummins
750 Watts Solar Morningstar MPPT 60 Controller
2014 Grand Cherokee Overland
Bob