13V is a tad low, it ought to work, but if you could get another half volt or so you'd be better off, especially after you deal with the drop in the wiring all the way back to the battery in the camper. The alternator does indeed have an internal regulator, I don't recall if this year has a Bosch or Denso alternator, but if it's the Bosch, IPD sells an adjustable regulator you can install. I've never looked closely at the Denso alternator in some later cars so I don't know the details of the regulator. Either way, you should avoid going above about 14V at the fuse box in the car or things like lamp life will start to suffer.
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15 years ago