The wire used makes little matter, and likewise its routing is not very important provided both wires are in close proximity to each other (so any inductive noise pickup is common mode--affecting both simultaneously--rather than differential mode). Twisting them together does help in this regard, but I would not think is essential. Having two sense wires near each other makes no matter at all; they are carrying what is essentially a DC signal, so there's no mutually inducted noise from one to the other to worry about.
The largest source of error in the wiring would likely be the DC resistance of the wires themselves, and that's utterly negligible for any somewhat reasonable installation as the current in the wires is minuscule.
Adding a baggage door hold-open latch to the side of an RV likewise does not add enough wind resistance to mess up the handling by making it pull to one side.