I am getting ready to wire in a converter, which will be permanently mounted in the rear of the truck and it was recommended to me to use nothing smaller than 4gauge wire (which the converters manual also states.)
It was further recommended that I use welding grade wire due to the distance it will be from the battery to the converter (rough estimate of 14ft) Welding grade wire uses (as I was told) a higher count of smaller gauge strands which offers better load carrying capacity with a lower end to end loss.
The point here is to back up Luke on this, given the amount of power that will be drawn through those wires and the distance (which yours will be much longer than mine) you are going to need something capable of handling that power.. And I just don’t see 10gauge doing it.
But this is only my opinion; I would still ask an experienced shop/installer what the best route would be to properly setup your truck for this…. The last thing you need is a fire caused by a wire that is not up to the job at hand. -thnkboutit-
On another note; you might also look into the Quest alternator swap as well… search the board a little and you will find a detailed How-To explaining about everything you need to know about it