If you're willing to spend the money, there are certainly ones that will do it. My company has done several jobs on the other side of the country from us. With a homeowner (or in these cases, house manager) that is willing to do some small things occasionally with direction from the integrator over the phone, it is entirely possible. When you do a job like this, though, the design must be good. We can engineer around a lot of potential failure points, or at least mitigate them substantially. This costs money, however. And the real kicker is most dealers will want the job to be a high-profit job to begin with, to offset any potential support trips or other complications.
If you're talking with a dealer located far away, perhaps they could work out a service agreement with a more local dealer, that way you can get the response time necessary for hardware issues, but have the engineering and technical support (as well as primary contact) of the far-away dealer. Again, this all costs money, so if you're not ready to shell out $$$, I don't think you will find any company willing to tackle it.