MAKA gets my vote if you’re still keen to have one. It’s probably not necessary but Trump has an 81% disapproval rating in Canada with only 11%!thinking he’s a swell guy, so it probably couldn’t hurt. Also, MAKA seems like a nice sentiment anywhere.
MAKA 
“Make America Kind Again”
I’ve got the perfect one:
Don’t blame me, I voted for Jill Stein.
A mug, not a bumper sticker, but you could use this image to make one.
LOL…but when I showed that to my wife, her reaction was “That’s disgusting!”
I hope you’re joking.
Yeah, that’s best suited to my wife’s parameters too. And she was giddy to hear about that awesomely low 11% approval rate! I’m going to guess most of those are in the Mountain West of Canada, too—not the part we’re visiting.
I found something even more perfect for the particular occasion at Raygun in Des Moines and persuaded my reluctant wife to get it even though it’s a sticker, with the proviso that we will cover it with a relatively anodyne one of the same size after we get back from our road trip. See these two tweets:
I don’t see how that fits at all. You used it correctly in your OP: genuinely signalling your values to others. But I can’t see how this fits that definition or the derogatory right-wing definition (where you’re saying it just to look good, and don’t really believe it).
It just seems a jovial/snarky way (depending on context) to say no one in Canada will blame a random American for Trump.
I guess I could see using “Make America Kind Again,” but that seems insufficiently snarky for the defiant aspect you seem to be pushing. Unfortunately, nothing is occurring to me, as I’m not naturally as snarky as most other Dopers. My snark only occurs to me in the moment (and then I usually can’t say it for one reason or another.)
I’ve heard a variation of that line many times from Canadians, and I always understood it to mean, “Unlike you lunatic Americans with your gun stockpiles, it’s safe to travel about in Canada: even if you insult someone, you won’t risk getting shot for it”. Which, I mean, I’m far from a fan of the NRA, but given that I’ve never owned a gun (not since age ten at least), makes me feel like “hey, #NotAllAmericans”
Yes and no. That particular bumper sticker, yes I’m joking. But if you feel you must ignore the sage advice you’ve been given by some of our neighbors to the north, consider a positive message rather than one that might make folks focus on the “Trump” part and forget the rest of it. A Hillary '16 bumper sticker would do the trick. Identifies you as a non-Trump voter without invoking he-whom-we-should-not-advertise.
Don’t do this man, it’s highly inappropriate. You’re going out of your way and spending money to commit one of the biggest faux pas a tourist can make: flinging around your political opinion and messages in a different country. You don’t see British tourists going around displaying their opinion of Brexit, or Russians wrt Putin, do you? You’re a visitor, mind your own business. You’re acting like the stereotypical Ugly American, the one who thinks the world revolves around them and everybody’s just waiting to hear their opinion and be shown how to live.
Locals displaying political messages? Sure, they live there. A tourist doing the same, that’s just asking for trouble, no matter how positive or negative you think that message is. Leave your politics at home.
And it’s just not here, when I travel abroad I like to stay in hostels and meet people from all over the world. We meet and discuss our respective cultures, music, food, tv, most American tourists are respectful and do the same, but whenever some fellow traveller brings up politics, guess what, 9 times out of 10 it’s an American. Just don’t.
You want to visit Canada, you’re welcome here like every person from every corner of the world. We don’t hold indiviuals responsible for their entire country. Just be respectful, be a tourist not a missionary. Open your mind, take in the sights and the culture, but don’t fling your opinions around. Be a sponge not a spotlight.
“Donald Trump. His hair flows like maple syrup, he’s built like a moose, is constantly chasing beaver and is in collusion with Poutine.”
I hate Trump passionately but the OP makes me want to buy a MAGA hat more than anything else.
Or you could get some magnet stock at Grand and Toy, stick it to that, and hey! presto you’ve got a car magnet.
In fairness though there’s more interest in foreign countries about US politics than interest in foreign politics in the US. That’s not good or bad but just a general observation. Maybe in some far flung countries that’s not as true, and I’m not saying Canadians in general spend (remotely near) every waking hour thinking of US politics. But in all my experience Canadians care distinctly more about US politics than Americans care about Canadian politics. It’s kind of natural given the disproportionate influence of a much bigger (population) country on a smaller neighboring country.
That said, I completely agree with you at the bottom line. I find as American I’m sometimes asked about US politics when in foreign countries. I try to brush it off with boring and anodyne answers but if pressed I claim I don’t know or care much about US politics (though I know pretty much and care a fair amount actually). I would never broach the topic myself first, which putting a political sticker on your car specifically for a cross border trip is basically doing.
I’ve never heard of Grand and Toy, but that sounds cool, this is cuttable rubbery stuff like a fridge magnet?
The sticker is already stuck, but I did actually buy a second one without being able to consciously articulate a reason. Now you have given me one!
To the naysayers: save your breath. This is happening. I never said I don’t want to come across as an American. I just want to be my kind of American. Besides, my Canadian sister was very effusive about the sticker when she saw it on Facebook. 
Welcome to the Straight Dope Message Board, popomomo cocoyoyo!
Advice noted. But this is SlackerInc. It’s a fair warning to those who encounter him that he’s very opinionated.
“MAKE America KIND again” is gentle and appropriate. That may be the best choice.
“ANYONE ELSE 2020” made me laugh, and I imagine Canucks would appreciate it.
Oh, I see you went with something else, with Canada’s favourite polite word.
Unlike you, popomomo, or most others who post here? :dubious:
We’ve been in Canada with US plates many times over the past 20 years. We thought that with polite Canadians there would be no problem, but in the past 2 years we’ve had incidents including a drawing of a penis on our dusty back window and an egg thrown at the car when it was parked overnight in a quiet suburb. We can’t do a sticker, too risky around our area with rabid MAGA types, so we’re going with the magnets for our next Canada trip, and looking at these