Mad answered your question, now I will throw something out for you to consider.
Factory remotes seem to be a fair bit more expensive than what you might do on your own, if you were so inclined to put a system together from parts you bought yourself from various vendors.
The biggest shortcoming of a homebrew setup though is that it will not likely be as "clean and neat looking" as a factory kit would be. So you save money, but the net result is not as "perfect" as some factory installations.
I think many here at TBN have installed multiple rear remotes for not much more than the factor kit costs for one remote. Myself, I am in the SLOW process of putting together a homebrew T&T. In my case, it should come in costing under $1,100, but that will be for four rear remotes (three with built in pilot operated check valves, and one with float), and includes the cost of one top and two tilt cylinders, plus all hoses, fittings and quick disconnects.
I am just throwin this out as something that might be considered. Putting together a homebrew system of remotes is not for everyone. It can be a fun project but it could be frustrating too, if things don't go right...for whatever reason...