Worst US/Canadian border crossing

The "worst" was simply the motorhome search as we crossed into Canada. The guards searched every nook and cranny, bags, etc - all very politely and carefully. We sat on the curb with our 2 dogs. Whole process took maybe 20 minutes; and then we were sent on our way. But every crossing after that (going to Alaska and back; and then the next year, visiting Nova Scotia) was simply easy and quick - show our passports and recite our license plate. I'm assuming we were in some database that declared us to be "good people" or some such thing :-) But we also follow the advice of others regarding sunglasses off, window open, polite, forthcoming with answers but not chatty.