Again, I don't see the size as anything but an excuse against it. Surely in the US, it would have to be adapted to different areas' populations. I'm not convinced Indiana is so much less homogenous than, say, Sweden. They are definitely not all on the left side of Sanders.
And again keep in mind the Scandinavian countries have budgets which means that you can't always get the treatment you want/need even if you had the money.
I don't know where you get this sort of information. I will never not be able to afford my medication. I broke my arm and got immediate, affordable treatment and had paid time off work even though my job was seasonal. In the US, with insurance, I would have struggled, not only with hospital bills, but with work. If you have an issue that they cannot treat in the country, you can travel outside of the country for treatment. Even if you are poor and have no money - the state does that. There are private hospitals and clinics around - if you have money, you can use them. They aren't always that much more expensive and the waiting period for non-emergency stuff is less.
The bottom line is that you are against a single payer system. That's fine, be honest, but please make sure your actual facts are facts instead of things people hear.