Wow, cool ideas thanks for the input.  Bitflipper: the Sonitus telephone EQ is the one I used on the above link that I posted (top one) and then I ran it through a mild Magma distortion effect.  I could probably use more distortion, I'm also still working on the song and tempo and sound (patch).  I think the effects are working but I still haven't found a sound I'm thrilled with.  I'm amazed that I have like 30,000+ patches on synths/samples and I don't have one labeled 'ice cream' truck.  Kidding, sort of.

I should have specified, because it makes a big difference.  This isn't for a source track... i.e. I'm not trying to perfectly recreate the sound of an ice cream truck.  This is for a stupid reality tv challenge where the contestants have to make ice cream and the producers want the sound of an ice cream truck over top of it.

I'm with you, Matt. I like the first one better.
As the others mentioned, still a little too clean.
Narrow the EQ even more, a bit more distortion, and lots more reverb to put it down the street.
Maybe add a verrry slow flanger to get that doppler effect?
If I were the producer, I would probably want the effect of the truck in the neighborhood, not in my living room.
Know what I mean?
I think you are pretty good on the context, and really close to nailing the sound.

One question. Are you using this for a music project or foley work. I'm missing the sound of the truck's engine if it's for sound effects. Even at that, it may help to put a truck or car engine running on another track to help zero in on what you remember the ice cream truck sounding like. Just a suggestion. Otherwise, I agree that you are very close to what I remember.

No Foley, No FX.  Here's one I added your suggestions... less high end, more distortion, a bit of reverb.  A little too much distortion for my taste I think... particularily for television speakers.  But closer?

http://www.koskenmaki.com/icecreamrev.mp3

That sounds pretty good on my laptop speakers.
True, it's more distortion than we would normally want to hear, but about right for an ice cream truck.
Those guys always over drive that poor speaker.