I'm visiting the US in September and I was wondering if anyone had ever encountered any problems using non-accessible sedan taxis while on their own?

I've used them in California before with no problems but at that time I was with my brother, so he was able to break the chair down and put it in the boot.

I can transfer easily enough through the narrow doors but will taxi drivers be prepared to take the wheels off the chair and put it in the back? Or will they just palm you off, I know taxi drivers can be a bit hit or miss with regards to demeanour!